None of those systems cand be considered a good choice. Why ? Well, in first system the videocard is too slow for the CPU, while in the second system the CPU is too slow for the videocard, I know that because even Athlon 900 is not enough for a V5 5500 AGP, so you can imagine that a P3 800 is even worse for a V5 6000.

Ideal choice would be Barton 3000+ (166 FSB) on a KT333 board with V5 6000, because I think that if you can afford a V5 6K, you will afford such setup, a fair price should be less than 100 $. Of course that a Core2 Duo System with a V5 6000 used with a AGP to PCI adapter would be even better, but such adapter is not easy to find, and the performance gain would be small, Barton 3000+ with DDR is quite a nice CPU for the V5 6000, you could do a Barton 2500+ @ 3200+, overclocking a KT333 board, but that a little risky.