I also tried pricing out dell studio 15" comparing it to my current macbook 15" pro (8 months old, not unibody, 2.4Ghz w/ 2GB of ram) and it costs $900 vs $1400 when I bought the macbook pro. It also has 4GB of ram, I couldn't get a 2GB option, the HD is bigger and getting a 1080p screen on it just costs $50 more.
...although it is on offer at the moment. Generally I'd be wary of comparing a dell to a macbook pro, given the formers' tendency towards plasticy tat. A high quality laptop like a T400 seems a more reasonable comparison.