I need to get a laptop for school and I want to be able to play games at decent quality. I have 1200$ to spend. Should I get a good laptop or spend 700$ on a laptop and 500$ on a desktop. Games BF3, Mechwarrior Online, Mechwarrior 4, Doom 3, Rage, and Dues Ex: Human Revolution. 40+ fps at 1080p. Higher for Mechwarrior Online
if that is your bidget limit, it would be pointless to split it among both you would get mediocre gaming on each at low settings, I would just put it all in to a decent gaming laptop, either something with a A10 AMD APU or intel with dedicated nvidia graphics. but still with $1200 you wont get an amazing gaming laptop, just enough to be equal to maybe a $700-$800 desktop build
out of all these, go with sager, only bump the CPU from i5 to i7. It's still cheaper than the MSI at that point, but with better GPU than the MSI. xoticpc force is overpriced, it's basically the same thing as MSI only with GPU upgraded from 660 to 675.
With all that said, all 3 are solid laptops, but what Sunius is saying is true - a desktop will be able to run circles around the laptop, any day. Main reason is, all those laptops come with 1080p screens, unfortunately none of GPUs will be able to run the latest games at 1080p on high settings.
another thing to think about. Where are you going to school? Have you seen the dorms you'll be staying at? Not every room comes with AC, so in spring/fall you'll be running the risk of overheating, since laptops inherently run a lot hotter than desktops