[Corsair]

I am running NYGM and GWX on a laptop (mostly with external CRT monitor) 1.8 G Intel Centrino, 512 RAM and 128 meg ATI video card.
No problemo, only going down to around 20 fps in harbours because of traffic but for me acceptable. Would suggest you get one wit 1024 Ram as it is mostly standard now. The good ones also have a 256 meg video (mine is almost 2 years old)
I use FS Autostart for disabling unnecessary programs and services and defragging memory before launching (frees up average 100 k available ram). Also make a weekly upkeep of the system (cleaning of junk files and registry, disk defrag)