Hi guys, I'm currently 3 boxing shamans on my (incredibly shite) laptop, and I am planning to get a new desktop soon I am just wondering how much of an improvement I should see fps wise.

Current stats:
Intel Core 2 Duo Processor T5750 (2Ghz, 667 Mhz FSB, 2MB L2 cache)
Up to 1536 MB ATI Mobility Radeon HD 3470 Hypermemory
4GB Ram
250GB HDD

New stats:
Intel Core 2 Duo E8400 (3Ghz, 6MB cache)
ATI HD5750 1GB or nVidia GTS 250 1GB (whichever is better in your opinions)
8GB Ram
1Terabite HDD

As you can probably tell I'm only young and strapped for cash so not much can be done about that.

EDIT: Forgot to mention I currently pull an average of 30-40 fps while 3 boxing.