I'm loving my new Dell 9300. Very good quality. It's only got 1.73 GHz Pentium M processor and 1 GB of DDR2 RAM @ 533 MHz. It's really quick and plays games pretty well.
The Pentium M is the way to go if you want performance and maximum battery life. Out of a 6 cell battery, I can get 4 hours under mostly idle conditions. I can get 2-3 hrs of mild work and no music. 1-2 hrs of heavy work (or gaming) and music.
CPU: Intel i7 2600k @ 4.4 GHz
Cooler: Cooler Master V8
Mobo: ASRock Z68 Extreme3 Gen3
RAM: Corsair Vengeance 16 GB DDR3 1600 MHz
GPU: EVGA 560 Ti
HDD: Cruicial M4 SSD 128 GB
HDD 2: WD VelociRaptor 300 GB
PSU: Corsair TX650w
Case: Corsair 600T Graphite Series