Well, I need to give up my current desktop for my sister (don't ask why) so I need to build a new one.
What I currently have are a Coolermaster HAF case and a Seasonic SS 750JS PSU.
I also retain my HD4890, but it's okay if the recommended system needs a new Video card too.
I'm looking to build a homebuilt system that can last at least 3-years.
'can last' means that it can sustain my gaming.
e.g. my Q9550/GA-EP45/2x2GB Corsair Dominator/HD4890 system was built in 2009 and has no problem playing game in 2012 (e.g. Crysis/Shogun 2/Black Ops)
I don't do OC, my computer is primarily for AutoCAD and engineering softwares, which I think has lower demand than gaming.
My minimum demand is basically just a replacement for my old system, but a replacement that allows me expand.