PC Rebuild advice

I'm in the research phase of (re)building my PC. I will get probably a
2400+ processor and 512 ddr and ect. I'm basically only doing this so
I can play Half Life 2.

questions:

My budget is $50-$75 wich video card should I get? I'm looking at ATI
Radeon 9000-4x/9200-8x or GeForce fx5200-8x/Geforce4 MX440 (all 128
mb).

Is it better to get a faster 4xagp card or a slower 8xagp card (keep
in mind it'll cost an extra $20 for a mother board with 8x
capability)?

I'm replaceing all of the guts of my PC except the audio card and
drives. What all would you get that would total less then
$300(includes=motherboard(must have 5 PCI slots),CPU,fan,Video card,
RAM)?

Here is my Idea:

Mother board = ECS L7VTA (5 PCI, 8xagp, 3DDR, 333/400fsb) = $55

CPU = AMD 2500+ (333fsb)= $85

fan ? = $20
RAM = 512DDR-2700 (333fsb)= $60

Video Card = ATI Radeon 9200, 128mb, 8xagp = $70

total $290

see any flaws?
thanks for the advice
JJ