Whatever you do, make sure to test SketchUp on the tablet before you buy it. I tried SketchUp on a Surface Pro in Best Buy (the guys there were super helpful about letting me install it on their demo Surface Pro), and the high resolution screen made some SketchUp elements so tiny that my eyes watered. Even the endpoints and lines shrink down to nothing.
I’m sure SketchUp will eventually fix the high-resolution shrinkage issue, but for now, it actually helps to find a screen that doesn’t have a very high resolution.
It’s a challenge nowadays to find a low-res screen with a really good processor and sufficient RAM, though.