Help me buy a new desktop! Quad core VS. All in 1

[Firesale]

Hey everyone, I am getting some money for a desktop soon and I'm searching for the best bang for my buck. I have a few options in mind and I want some opinions! If you know computer performance please help me! I am looking for a desktop about $500-Maybe $600 I am trying to avoid expense because I have to pay rent. I need lots of memory about 500GB and hoping for 3-4 GB of RAM, A duel or quad processor, As well as a decent graphics card since I am in GFX. I found a nice ass refurbished All-in-one desktop on best buy that looks favorable, I have researched it and how to replace ALL hardware so I know what I'm up against, Please Suggestions?!?

The all in one:
http://www.bestbuy.com/site/HP+-+Factory...Id=9810629

The quad core:
http://www.bestbuy.com/site/HP+-+Factory...Id=9763075

[Foresight]

No contest, get the second one. It has twice as much memory, more storage, better graphics, and it's $30 cheaper.

[Firesale]

Thanks, I noticed more pros than cons with the quad but all in one seemed cool. I think I will go quad core.