GforceFX 5200 NON ULTRA like the one you have listed is no faster that a GF4MX a GFX 5200ULTRA is as fast as a GF4Ti4200, which can be purchased for $90-120 depending on manufacturer and how much ram 128MBvs64MB. I would go with a Ti4200 or a radeon 9500pro or non pro. You will save yourself some money by getting an EPOX 8rda+ board as opposed to that ABIT, but really unless you plan on overclocking the ABIT seems to be a tad bit better at it, also do you REALLY need serial ATA it is marginally faster the drives cost a sheot ton more. With that being said the only difference between the EPOX and the ABIT is serial ATA and a huge price difference. Also cruical memory had some issues with nforce2 boards that i do not know if they got straightened out, I would go with Kingston HYPERX, also if your gonna get a XP2600 I would suggest saving money and getting a 2500 "barton" which has a larger on die cache, it will outperform that 2600 and is cheaper.
Epox Motherboard for AMD Athlon/Athlon XP/Duron Processors, Model# EP-8RDA+ $85 shipped at newegg
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AMD ATHLON XP 2500 "Barton" 333 FSB PROCESSOR CPU- RETAIL $96 shipped at newegg
KINGSTON HyperX Series 184-pin 256MB DDR333 (PC2700) 32X64 DDR RAM modules, Model# KHX2700/256 buy 2 to take advantage of dual channel bandwidth on nforce2 $90 shipped for both
POWERCOLOR ATI RADEON 9500 128MB DDR 8X AGP RETAIL $145 shipped at newegg
TOTAL of $416 with free shipping on everything