I use a Dell Precision 5520 as my daily driver and have been very impressed. The things I like about it are a good backlit keyboard that hasn't been forced too

I use a Dell Precision 5520 as my daily driver and have been very impressed. The things I like about it are a good backlit keyboard that hasn't been forced too thin, a bright screen I can see in sunlight, and a good battery life that hasn't significantly diminished as I have owned the laptop. The only complaint I have is it will sometimes turn itself back on in my bag and drain it's battery. The Precision 55XX line is basically their XPS line with a Quadro card baked in. The new 5550 model has a few spec bumps and a slightly nicer webcam placement and would be my recommendation if you need a Quadro card. Otherwise check out the latest Dell XPS line.