The title says almost all of the info you need. Only two things you should know: This $2500 must include speakers a monitor a keyboard and a mouse. Also I would highly prefer to sli two Galaxy 4gb GC edition 670's which costs $940. So that is nearly half of it right there. BUILD AWAY (and thx in advance)!
What are you going to be using it for? multimedia? gaming? surfing the web? Gotta know this stuff before we can fully optimize it for what you need. You can ckeck in the top post under new build to see how to format it.
^ His build but with changes:
If OP isnt doing professional editing or something, ditch the i7 for the i5 3570K
A bigger SSD. The OCZ Vertex 4 is in reach here and its no joke when it comes to speed.
Replace the 680s with Sapphire 7970 GHz Editions. If not, dual 670s. 680s just arent worth $500 over the 10% performance boost compared to the 670.
And the PSU is fine, but if you want modular, get the Corsair HX or Seasonic M12IIs, maybe the XFX XXX too.