The Apple 15" Macbook Pro is 2.4ghZ, 1.5 gigs of RAM, 8600m GT video card, 120GBs of Space.
Overall the Macbook Pro is probably one of the fastest laptops available. It's processor is top of the line currently and it's video card is very high end. I would recommend you try out OSX if you've never used a Apple product before, but if you are not happy with it you can boot into windows.
Aesthetically, the Macbook Pro is housed a very thin, light, aluminum case. It has a illuminated keyboard which is perfect for using in the dark, and it's 15" is absolutely beautiful. It is one of the first laptops to feature a LCD backlit screen, which is better for the environment, brighter, and uses less power.
One thing I would like to talk about is the cheaper model, that is $500 less. Personally, if I would buy a Macbook Pro again, I would go with the cheaper model. the extra 256MB of RAM on the video card and extra .2 ghZ IS NOT worth $500. I would recommend getting AppleCare though, which is 3 years of tech support and a warranty.
Overall I really enjoy my Macbook Pro, it's amazing to work on and does everything at blazing fast speeds.