I still say you should keep the $500 build. It forces you to make educated and informed decisions. When you start to get sloppy you inflate the build to $600 or more. It's extremely easy to make a much better build with more $, but if you stick to the strict $500 build budget, than your knowledge will come to the fore front. I don't like the mobo that was selected for the $500 build. If I were to build a $500 build right now, I wouldn't even have an Intel CPU in it. Only because the mobo's in the $50-70 price range, just don't support much options. The lack of USB ports and the type, is just one of the things. If you look at just about ANY AMD based mobo (AM3 and up), you will notice that the options that are present on the mobo's are just that much better than just about any Intel based mobo in the same price range. Most of the AMD based mobo's (AM3 and up) usually support even the top tier of AMD CPU's. Intel's $50-70 price ranged mobo's don't always support the fastest Intel CPU's. I would much rather have a fully featured board at a given price range, than have a weak featured mobo.
So to sum up what I'd consider a good $500 build:
* $50-70 fully featured mobo (if at all possible, or at least as fully featured as could be)
* 3 to 4 AMD cores, if possible (The i3 2100 would be fine too, but is a bit spendy at $125 for this kind of build)
* ~$100-150 for the GPU
* 4 gb's of DDR3 RAM
* Decent Case, with room to upgrade (add adition fans if needed later)
* Solid Quality PSU 380w or better (Antec, Corsair, Seasonic, PCP&C, to name a few good brands)
I know AMD has been pretty much in most of the SBM's in the $500 range, and this is because they are a good value in the price segment ($400-500). Once you start to get over $550 or so you start bumping into the Intel zone. This is where the build can come down to personal preference.
I think that right now is a good time to build, if your going with a SB based system. I'd probably build the SB system around a z68 based mobo, so you have more flexibility later. The H and P based SB mobo's just seem a bit restrictive, IMHO. I know they have their uses/places, but for me they are just average.
If you building a system around an AMD platform, than the Phenom II x4 955 BE should be where your starting the build at. You can save $10-20 by going with a Athlon II x3, but I think the 955 BE is the sweet spot CPU for AMD right now, IMHO. They were $115 - $15 promo card earlier last week at Newegg, which puts it at $100!! If you want to chance a bit of future proofing (if it pans out that way) you can get an AM3+ based mobo. The only thing is that your going to have to pay around $100 for one, which sorta pushes the $500 budget too much.
Sorry for the rambling, but I think what I said needed to be said.
*** Keep the $500 SBM build and please work at it a bit better next time. No >$500 build, like the current $526 build. Stick with the budget and leave it at that. Also make sure you include shipping, because I can buy parts all day long, but if there is an exorbitant amount of shipping costs, it's all for not. You can increase your costs by 10% in a $500 build, if you don't count the shipping.
*** I'd like to see $500, $750, $1000, & $1500 build points. This way you can see how far your $ can get pushed. Especially since money is quite tight in the economy.