Raven, I'm currently working on my new computer as well. I'm choosing the Pentium 4. Despite the higher costs, I feel it is the better choice for me. How much are you looking at spending? I keep reading the forums day in and day out, only to find more and more people with Athlon problems. Not to say they're bad or anything. I've owned two, but sold them to get my current laptop. The A7V was a pretty stable board overall, but was flaky sometimes in performance. I run Win2k Primarily, which isn't very VIA friendly, however updates are coming out weekly/daily. The A7V133 I had was pretty good, but again, flaky in performance. WinME/Win98 were the only OSes that ran pretty decent. The bootimes were incredible, to say the least.
Baiscallly, either way, you should be set for a very long time. The SSE2 software implementation looks promising, along side with nVidia drivers. Did you read that Tom's Hardware review about the nVidia/P4 performance boost when nVidia began to write in tweaks aimed at the P4? Pretty impressive performance boost. All in all, it's up to you and how much you want to spend.
Good luck!
Current PC Specs of the PC I'm building:
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Motherboard: Asus P4T
CPU: Intel Pentium 4 1.7GHz
CPU Cooling: ThermalTake Indigo Orb
Memory: (4) 128MB PC800 Samsung RIMMs
Case: Fong Kai 320 (FK-320) (Thumb Screws)
Power Supply: 350W Enermax
Case Cooling: 120mm Panaflo Intake, 90mm T&T Exhaust
Sound Card: Turtle Beach Santa Cruz
Sound Add-On: NewQ Platinum
Video Card: Elsa Gladiac 920 (GeForce3)
TV Card: WinTV To-Go (have)
Hard Drive: IBM 40GB 60GXP Series ATA100 7200rpm
DVDROM: Toshiba 16xDVD/48xCDROM
CDRW: Plextor 16x10x40x
Storage: Mitsumi 1.44MB Floppy Drive
Network Card: 3Com 10/100 w/ Remote Wake Up 3C905C-TX-M
Speakers: Boston Acoustics BA4800 (have)
Monitor: 19" ViewSonic PF790
Mouse: Microsoft IntelliMouse Explorer (have)
Keyboard: Microsoft IntelliType Pro (have)