I wouldn't use a laptop for gaming unless you have some wild cooling. I admit I haven't had too many lap tops, but since you gotta buy them (even custo built,) I find them to be really HOT especially for things like long gaming sessions. I've never experienced (or rarely?) problems cuz of the heat, but hot to the touch cpus are a bad look IMO. I even got a desktop replacement laptop for awhile and that was HOT too.
And like dude said re 2500 yea... you can get a desktop for like (well I dunno how parts are now) 1000~ and it would be better than the best laptop you could build. A lot of places on the net say they will make you a laptop, but it's hard to know what you're gonna get.
My PoV now, get a tablet or a cheapie laptop and get a desktop. Laptops are for like emulating old consoles, writing, movies, etc... you don't wanna be playing games that are gonna push your shit.