In reference to your PM, I don't know how much help I can be. I don't know much about video editing. I hope you know what the requirements are.
Motherboards that have the same chipset are all nearly equally fast whether the motherboards cost $70 or $170. If you look at the comparison reviews you often find the ranking changes dependending on the benchmark. Sometimes the reviewers make ridiculous remarks, like "the TEQILA11 leaves the KUDZU92 in the dust" when the difference is only 1%. Then they express bewilderment when in the next benchmark the KUDZU92 tops the list. When one mobo seems to be ahead in all benchmarks, sometimes reviewers have determinened that the mobo manufacturer has set the clock rate 1 MHz faster. If your mobo allows it, you can do the same thing with a setting in the BIOS. In other words, the manufacturer overclocked the mobo.
Mobos do vary in the features they have (sound, OC BIOS, RAID). They also vary in the quality of engineering, the quality of the components and the quality control by the manufacturer, none of which is known. Support directly by the manufacturer varies from poor to impossibly bad, although they will replace failing mobos. The instruction manuals (which you can often download from the manufactures sites to see) varies from complete, if vague on important points, to incomprehensible translations from the Chinese.
Lets face it, most reviewers don't do anything much with their computers. They are tekkies who love the hardware itself. Making a realistic judgement about what a given combination of hardware will accomplish, beyond frames per second in some 3D game, is beyond their personal interest. Intel or AMD could tell them anything about what a great benchmark a particular test is, and they wouldn't know the difference.
Considering performance, it is difficult to find a situation where an equal amount spent on an Athlon system won't get you higher performance than a Pentium 4 system. Until you get into prices beyond Athlons.
Spending at the top-of-the-line level has never made sense to me. The price escalates too fast. And how important can it be to get the best when in three months it won't be top-of-the-line any more? In a year, it will look foolish.
The first advantage of a P4 will be SSE2, which AMD has yet to follow Intel on. These added CPU instructions appear to be almost totally why the P4 solidly beats an identically labeled Athlon (2000 vs 2000+) in media-encoding benchmarks that have been written to use those instructions. I think the price premium you pay ($50-$100?) might be worth it to someone avidly interested in this. OTOH, if you don't do this type of thing intensively, the fact that an Athlon might be a notch slower would not be bothersome. Another thing is, if it is compute-bound, where you have to wait till it gets done, you can just have the computer do it while you're off somewhere else, or sleeping at night if takes that long. If they write the program properly, you can word-process or surf the internet and not know it is churning away in the background, and your program shouldn't take much longer to finish either. Should be no problem on Windows XP. (Pro version is pointless to 99.99% of the people, beside being a PITA.)
The second advantage of a P4 is memory sloshing. In manipulating huge files, such as images, just moving the file around within memory and to/from the CPU at high speed cuts into processing time quite a bit. The P4 with RDRAM excels at this. Maybe you can get 2 256M 1066MHz RDRAM for less than $250.(Intel is phasing out RDRAM chipsets for some reason.) With DDR DRAM, there is still some advantage. You should be able to get 512M PC2100 for around $120.
As you move the P4 speed down, the difference vs price gets to be questionable, so I think this makes sense:
170 An ASUS P4 Intel 850x style mobo
200 P4 2.4G
240 512 RDRAM
610
Maybe this:
120 An ASUS P4 Intel 845x style mobo
210 P4 2.4G
120 512 DDR
450
compared to this:
130 ASUS VIA KT333 style mobo
110 XP 2100
120 512 DDR
330
Choosing depends on how important that extra performance is. I don't think it could be more than about 20%. Intel will probably sell a 20% faster chip for the same price in six months. To me it isn't important. To some, it's the $300 that is hardly worth thinking about.
Why 2100+ vs 2.4G? I eliminated the Athlon 2200+ because it was the top-of-the-line Athlon listed on pricewatch. I bumped up the P4 to 2.4G because it had nearly the same price as the 2.2G If you go to a 2G P4, you are going to have a hard time seeing any improvement over the Athlon.
I only picked ASUS because they have a sterling long-term reputation with their higher priced motherboards. Many people swear by other brands too. EPOX. IWILL.
Intel chipsets are the least quirkey of them all, if only because it is the one for which hardware designers design their add-ons. The recent SIS chipsets have gotten a great reputation and have excellent performance at a cut-rate price. As I understand it, SIS has a license (from Intel)to essentially clone Intel's chipset.
For Athlons, VIA chipsets are the ones that predominate, so it is the least risky to use with plug-ins and add-ons.
What I am looking at right now for myself: EPOX 8K5A3+ with XP1600+ OCed to 2100+. What's holding me back? I want to know if it will handle HDs over 127G (which will be normal in a year.) I also want to see an nForce2 before I decide, and I want to see the T-bred B, and ...
The only video editing I ever did was to cut and splice some crumby, approximately 10M MPG clips and it took about 0 time waiting for the computer. This is on an Athlon Tbird 1400MHz, ABIT KT7 mobo, with 256M SDR memory.