Actually, please don't sticky this as there are so many things wrong with your post that it may confuse people more.
A) The AVGA never came in PCI.
B) The new system probably either has PCI Express and maybe a couple of PCI slots or no expansion slot for video(If you give us the model number, we can figure it out). If it really is a "monster system" I don't think you meant to say get a new PCI card. I believe you meant PCI Express, which is entirely different. They shouldn't of even put PCI in the name as it is because it seems people are having a hard time differentiating the two.
C) You assume his system is i8xx based.
psychlone78 does have other options.
1. Keep the system as is and make do. Probably would be fine. Just don't get all the specific resolutions, but maybe you wouldn't care.
2. Get an OLDer PCI card to use with advance mame.
and maybe more options.
A) I was under the impression the older Radeon 7000 based AVGA was a PCI device? Apologies if it wasn't. In fact, some quick googling just now seems to confirm it wasn't.
B) No, I meant PCI. The large majority of systems still have some PCI slots (much like it took many years before we saw the death of ISA slots from PCI boards). And MAME certainly doesn't *NEED* and AGP card, nor a PCI-Express card for that matter. And yes, there are plenty of retailers who still sell new PCI video cards. Not new as in "new chipset", but new as in "not second hand". Most of these are older chipsets like Radeon VE/7000, Radeon 9200, Nvidia GeForceMX400 and FX5200 cards. These are perfectly fine for MAME, and also will reach lower resolutions with tools like SVGALib and AdvanceMAME much better than integrated Intel video.
Here's an Australian reseller who sells *NEW* PCI video cards:
http://www.gamedude.com.au/prod_list.php?maingroup=VIDEO%20CARD&secondgroup=ALL%20PCI%20MODELSI'm sure you can find much cheaper and more variety in the US, based on your market and population densities.
C) Aren't most cheapy Dells? And even if they aren't, the i9xx video sucks just as bad.
1. If you're happy sticking to 640x480. Lower resolutions are difficult to do with onboard intel video, which is generally total pants. And if you've got a genuine arcade monitor that can do low res, you sure as hell want to use it. Not doing so would be a complete waste (and a crime, to some people).
2. That's what I said 2 posts ago, and you told me I was talking about PCI-Express, when I certainly was not, and then you proceeded to tell me I was giving bad advice!
At the end of the day, the OP should have put some research in before parting with his dollars. And everyone else should do their best to avoid Dell all together.