And if you are buying a new system get an SSD, there is no reason you shouldn't.
Oh, except theyre extremely costly, have very little memory capacity, and provide almost no real benefit in game, or anything really what so ever. You might save 5 seconds on a loading screen... Despite that i have twin SSD in Raid 0, but that was a personal choice and i had the cash to drop.
Despite that you said you want a laptop, i'd still highly suggest a desktop. The performance for price when you compare desktops to laptops is about 3:1... A 3000$ laptop is worth about a 1200$ full buy in (no carry over parts) custom PC... And with that out of the way...
Asus, Sager, and believe it or not Alienware are my 3 choices. People spit on alienware but the fact is that their laptop prices are competitive in the 2000$ range, mentioning you can get an 18 inch screen where most other companies dont even offer one, for the same price as their equivalently geared 17 inches... If you want to just have a small, but still powerful laptop, i'd recommend Sony's S series... They have, imo, the best laptops of their size, for a reasonable price...
However, for a real gaming laptop i'd look for something worth no less than 1500, being that you cant upgrade the damn things. For a PC, you could drop 600 (for the same performance, maybe better), and then upgrade it at will.
I would never, ever recommend a mac for anything other than digital media work. Theyre expensive for their hardware, and aren't designed as gaming platforms...