Your post and the machines don't seem to match.
I'm looking to buy a new desktop (mainly to create a few VM's and a virtual domain) and wanted peoples input on system requirements. At the moment I'm looking at 2 machines, specs below:
Intel Core i7 Processor 920 (2.66GHz, 8MB cache, 4.8GT/sec)
Memory : 8192MB (4x1024,2x2048) 1067MHz DDR3 Dual Channel
500GB Serial ATA (7200RPM)
512 MB DDR2 ATI Radeon HD 4350