Have you considered upgrading with a motherboard with onboard GPU?? Not sure why your stuck on an AGP slot, but in the long run your better off with at least a PCI-e (v1.1 or 2.0) slot available for GPU upgrades. Your going to have a time finding a mobo with AGP/2 IDE slots. It can be done, but I think it's wasting your $. I'd consider getting a mobo with an onboard GPU, assuming your not gaming too much. AMD has some good mobo's with a decent onboard GPU (780g/790gx chipsets). They are about $70-120, depending on which one you get. Than just add CPU (60-100) and DDR2 (15-40 after MIR's). Than consider getting a faster HD for about $50-75 and your set! Intel has offerings too, so don't rule them out in this price range, their onboard GPU's aren't quite up to AMD offerings yet.
If you opt to upgrade/change the DVD burner instead of the HD, than you'd save about $27 on the total below.
Total (CPU/Mobo/RAM/HD) = $217 - $25 MIR's = $192!!! And if you drop the HD upgrade and insert the DVD burner above your total would be: $190 - $25 MIR's = $165!!! Now I don't know what kind of graphics your looking for so if your a hard core gamer on AGP than that would change things up, but the 780g onboard GPU can easily handle WoW and similar games. It's up to you, but you'd be better off with a PCI-e slot than sticking with a dated and pretty much dead AGP slotted mobo.
I like the intel option.
it's not asus
but I don't like that it relies on rebates.
Well that tends to be the usual with Intel builds. AMD mobo's tend to be a bit cheaper and usually don't always need rebates to sell them. Not that Intel mobo's are bad, they just tend to be more expensive over AMD ones.
I'm not really stuck on AGP. It's just that I RMAed an AGP video card yesterday (BFG Tech 5500 FX OC), and if I buy an AGP motherboard, I won't have to buy a video card. I thought it would save some money.
I looked up the price of RAM, and surprisingly, DDR-400 is about the same price as DDR2-800. I think it would be best to sell what I've got and buy a higher speed. It would give me a bigger selection.
While Newegg is a great website, they have a distribution center in my state (unfortunately) so I have to pay tax on everything I buy from them. Pretty much every other website has better deals if I do items on newegg with tax Vs. some other site without tax.
Trust me when I say the AMD 780g or 790gx onboard GPU is much better than a 5500fx!! Now you can still get any of the options above and still get a decent dedicated GPU later. Hopefully you can get some decent $ for what you have and use it for a nearly complete upgrade!