I'm looking to get a laptop, and I want your opinion on which one to get, because I'm a dev and don't care about whatever most reviews are looking at. Here is what I want from it:
1. I'll be running linux on it
2. I need it to be powerful enough to go through heavy development
3. It has to be decent sized 15" and below
4. It needs to stay cool under light load, under heavy load I've got a good cooling pad
5. Battery is not that important, and discrete graphics are not that important

I will be hooking it up to a keyboard/mouse/monitor setup when at home or work

Any suggestions? I've been looking at lenovo thinkpads for their ruggedness and dependability and Dell laptops as they've been around for a long time. Ultrabooks (like the XPS) are appealing but I don't know how well they deal with heat and thermal throttling under heavy load?