4k for just the box!? You're a fucking nutcase!
However, I'd get something like this: http://www.secret.com.au/cgi-bin/computers/builder3.pl?view+1054248
It's got the lot, 450gig of harddrive, 2gig ram, a CPU equivelent to a 4.8ghz pentium, the best (imo) gaming keyboard and mouse combo and...