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Everything looks compatible right?
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Sorry, looks like not, presuming your links are correct.
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eVGA 256-P2-N515-AX Geforce 7800GT 256MB 256-bit GDDR3 VIVO PCI Express x16 Desktop PC
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This is a good choice, the 7800GT is a fantastic card for games. Note the PCI Express interface,
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ASUS A8V Socket 939 VIA K8T800 Pro ATX AMD Motherboard
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Following your link, this is an AGP compatible motherboard, not PCI Express.
These two will not fit together. You need a PCI Express Motherboard for this VGA card.
I prefer an Nvidia board to a VIA, try anything with an Nforce 4 SLI chipset
link
I also may consider the
Athlon64 X2 Dual Core CPU - the one I have linked is a 2x2.0GHz, and is cheaper than the 1x2.4GHz you have linked. If Gaming is the only concern for this comp, then a higher clocked core may be better, but so far (only two chips), I have not seen an X2 3800+ that can't overclock to 2.4GHz+.
If the comp may do other tasks, for example downloading stuff while also playing games, the X2 wins by a country mile, overclocked or not.
I hope all goes well,
dave.