Well, a laptop certainly has its merits. I've come to know it now that I'm employed, don't always find time to sit my butt down on a chair, infront of a table and play games on PC and stuff. I have spent so much money on my PC that now it just seems...wasted. I mean I rarely get to play games and stuff. With laptop, at least you have the advantage of its portability. You can play some while on a bus or in your free time in office/university/college or heck even in bed at night when you dont feel like sitting on a chair in cold.
So I'd advice you to get a laptop, one with a nice GPU, that fits your budget and can play games at decent settings. And if you can, keep that 560 Ti just for the backup.