My spec wish-list for the upgrade is as follows:
Quad Core i5/i7 CPU (or fast dual core if these aren't released)
4-8GB RAM
Radeon 5470/5670 class GPU
SSD or roomy 7200rpm
14" display with WSXGA+ would be nice (I've noticed they don't offer this for some reason)
oh, and like 12 ThinkLights



