If you want that kind of performance, its not gonna be "cheap" and if you want good video to go with the CPU speed, you might as well get something like a I9100/XPS, or the new I9200, the 9200 boasts a max of 2GB RAM and has a 17" widescreen WUXGA LCD, it also has the Dothan processor and Montarra GME (855 GME) chipset, an upgradable graphics card, and optional internal 802.11x wireless card. It starts at around $1500 with much lower specs than I listed.
The XPS: You can get it with a 3.40GHz P4 w/HT, 2GB DDR400 memory, 100GB HDD, 256MB ATI Mobility Radeon 9800, a DVD burner, internal wireless card and 4yr warranty(including accidental damage) for around $4500. You can get it somewhat less equipped for around $2000
Also, if you can find one of those equipped like you want at the oullet, as RBS mentioned, you can save quite a bit, and as he said, the refurbs are as good as new. In fact, some are new(many are from where a customer or salesperson made a config error and the customer exchanged it, that system is no longer considered "New")