so recently i've been really getting into music production but my computer blows. i'm looking for a desktop that has as much ram as possible and dual core+ for around 500 dollars. the stuff i'm doing requires lots and lots of tracks and programs and processing stuffs and shit to be running at the same time, and i'd like to also plug in a midi keyboard and some recording gear. basically, fastest computer possible for lowest price? i'm sorry i can't really be more specific.
i've asked some producer friends to help and browsed some sites like slickdeals but i have no idea what i'm looking at =\ mayday!!
thanks in advance
edit: i am somewhat on a time limit too, so something preassembled would be the best. i'm fine with maybe sticking together really obvious and basic things, but the simpler the better please!