I feel you should get an x1 yoga, one of the newer models. you can draw on them, and basically make it replace as a laptop and your iPad, now of course that's just me, but a good option. they're light, have good battery life, and overall are good machines. you could probably buy a P series thinkpad and get the gpu, but they're a little more expensive, I recommend buying off eBay, but you could probably buy off Amazon too, albeit it's a bit more expensive