pickxx
this all getting off-track in terms of things for the OP to consider
To summarize;
1) IMHO, AGP comes with a price premium TODAY. So any savings by purchasing a "bargin" skt754 AGP system are likely illusory. May even end up spending more due to price premium on AGP cards.
Sadly, may not ever be any decent AGP upgrades in the future. Since posting yesterday I see that the reports announcing an X1800 series in AGP are untrue/erroneous.
Myself having an AGP system now, and agonizing over the predicament it puts me in, am trying to warn the OP away from finding himself in same unfortunate situation.
2) A kick-a33 CPU is unneccessary for gaming. Again, CPU bottlenecks kickin only at low rez's. I bring this up because if the OP thinks an equivilent PCIe system will break his budget he can go for a cheaper CPU, doesn't need a 3700+ for pushing the gfx card.