Dion Wired had a nice HP DV6 with an 15.6" screen and i7 processor with 6GB ram and 1TB HDD going for R10-R13K. It was on special just before Christmas for R10K, so I do not know the price now. It was the HP DV6-3090si. I do not see it on their website.
You can also get an HP Envy 17 for around R13k. Core i7 720, ATI HD5850. Only issue is that it has pretty crap battery life (no switchable graphics), and it runs really hot. But as a desktop replacement, it's pretty great.