I am doing the same build as you, but with a much lower budget lol. Anyway, with $1400 you can build a KILLER setup! But do you need a monitor? I will assume that you don't. Now here are the parts I recommend, and I have done a lot of research for my build, so this can help you.
Motherboard: Abit IC7-MAX3 = $204.99
Its like the Asus P4C800E Deluxe, but IMO its a lot nicer. Personally, since I have a much lower budget, I am getting the Abit IS7, which is a couple steps lower.
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CPU: Intel Pentium 4 2.6C (800MHz Bus with HyperThreading) Retail Box = $175
This CPU has the best price/performance ratio out of the P4s. IMO, I think that the actual real world speed between the 2.6 and the 2.8 isnt much. And between the 2.6 and 3.0, you might see a difference (depending on your current system), but it doesn't warrent the $100 difference. This is just my opinion though. And also, if you ever do decide to overclock, this CPU can hit 3.25Ghz (up the FSB to 250) with the stock retail heat sink/fan!
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RAM: GeIL Dual-Channel 1GB (2x512MB sticks) PC3500 DDR-RAM = $228
Memory causes a lot of controversy. If you ask 10 different people about what ram they like the best, you would probably get 10 different answers! But this seems to be good ram. Let other people give opinions about this before you buy it though.
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HDD #1 (For OS and Programs): WD 36GB Raptor 10,000RPM SATA Drive = $109
This is probably one of the fastest drives on the market. People have said that they see a huge increase in speed when using this drive. Programs load faster, windows starts up faster, etc. But since its only 36GB, you only need this drive for windows and programs, not for data etc.
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HDD #2 (For Data (MP3's, video, etc): WD1200JB (WD 120GB 7200RPM 8MB Cache ATA100 Special Edition) = $99
I own the 80GB version of this drive and I love it. WD is known for their speed and reliability. I have never had a WD drive fail on me yet. And you have a 3year warrenty if it did fail!
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Case/PSU: Antec SLK3700AMB with the Antec SL350 (SmartPower 350W ATX) = $72 Shipped
I own this case/psu and I love it! The paint quality is amazing, the PSU is stable and holds excellent voltage rails, and it provides for excellent ventalation. There is room for 2 120mm fans, one in the front and one in the back. The back fan is included, and is set up to pull air out of the case (as an exhaust fan). You only need the fan in the front if you want to cool your HDDs. BTW, this is one of the most quiet cases out there.
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Video Card: ATI Radeon 9000 128MB DDR AGP4X OEM = $69
I own this exact card and since I don't game very much at all, it suits me fine. When it was in my old slow P3 500, I was able to play games such as GTA Vice City, and Unreal Tournament 2003 at medium detail at 1024x768 with no chopiness. So even if you start getting into gaming, this would work alright. But for non-gamers like u and me, it is perfect. I watch a lot of videos (such as recorded TV shows and DVDs), sometimes I even hook up my computer to my TV, and it works great with this. Also, if you get an LCD, it has the needed DVI output, which some cheaper cards lack.
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Sound: AC97 Onboard Integrated (With SPDIF in and outputs)
This is integrated in the motherboard. IMO, it sounds great! I am quite the audiophile, and when hooked up to my 2.1 speakers, or my 5.1 surround system (powered by a JVC reciever) it sounds great!
Network: Intel CSA Integrated Gigabit LAN (10/100/1000)
Just a normal NIC, but it supports Gigabit LAN also (along with regular 10/100), so you are future proof for this.
DVD-ROM/CD-Writer: Lite-On 48x24x48x16 DVD-ROM/CD-Writer Combo Drive = $54
Just your typical DVD/CD-Writer combo drive. Lite-On is the best brand IMO for optical drives. This DOES NOT burn DVDs though. It reads/writes CDs, and reads DVDs. It is 48x24x48x16 (write/rewrite/cd read/dvd read). It is black, and it looks really nice.
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Floppy Drive: Samsung Black 1.44MB 3 1/2inch FDD = $7.50
This is just a regular old floppy drive, but its black, so it will match well.
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That pretty much sums it up! I think this is a nice system. It totals up to $1018.49, which leaves almost $400 for a monitor, keyboard, mouse, speakers, desk, credit card interest, etc. Leave around $20-30 for shipping though, because I only added in shipping for the case. Let me know what you think!
-Josh