Laptops are awful to game on in bed, unless you have a proper place to set it, it will run hotter because of blankets blocking its ventilation, so if you do get a lap top, make sure you game with it on a flat cool surface, otherwise you can fry it a lot quicker.
I know this is already addressed, but desktops are much better for gaming, but since u said you want to replace your laptop anyway, and its not a replacement for your desktop, i would encourage you to still use your laptop on a good surface for posture and heat of your laptop. I fried mine a long time ago by using it in bed, it got really hot and just blinked and never turned on again xD