a 3500+ is approximately equivalent to a X2 4400+, since the second core isn't used by games yet.[/q]
That's interesting. I haven't done much research on the X2s compared to the single core chips. I know that non of the MSFS series explicitly usees the second core because of the way they designed FS (fibers & whatnot), but people do note a significant difference because the OS and other ancillary functions can run on the other core, giving MSFS the whole CPU. This is purely anecdotal, but worthy of investigation.
You could increase your performance a lot just by upgrading the video card, but you might want to consider also getting a PCI-e motherboard, and the PCI-e variant of the card you're looking at. It would most likely end up the same price total as the AGP card alone. Later on, down the road, when you decide to upgrade your CPU, RAM, etc, at least you could still use your videocard... That's my plan. Similar boat, but I already have a 6600GT, so I'm not quite as bad off as you are at the moment
My dilemma continues because of the "wife factor". She has to understand the value of it, and I know she won't. (That's not really related to the video issue, though hehe.) Anyhow, since I'm not rich enough to afford a whole new AM2-based system, but recognize now, after re-checking my current mobo capabilities that I can just upgrade my CPU anytime to X2 (yea!). This makes upgrading much easier. I'll probably end up buying a new socket 939 mobo and video card (or two, if I can get away with it), and upgrade the processor later. After I upgrade the processor, I'll move the old mobo/proc/video into my wife's computer.

Then, my wife's old parts can be migrated to my 3rd box to make a better server than I have now. hmmmmm this could work!
So, I think, based on the stuff I have read, I'm not going to upgrade the video to another AGP card. It will cost a little more, but I think I can get more value from upgrading other components at the same time. Thanks for that insight, TucsonPi!
Relkin