I know of no cutting software from a tablet. Most cutters require a serial or usb port, which can be lacking on some tablets. The design software you get for tablets can be vector, but is going to be more primitive.
I'm like Dakotagrafx, I like big screens. I use two 42" hdtv's as monitors. One is in front of me, and the other is to the right in portrait mode hanging on the wall.
If you need a tablet for portable and school, get one, but budget a cheap desktop to stay with the cutter, drive the cutter and be more or less permanent. A Win PC good enough to drive the cutter can be cheap. A dirt cheap one, used maybe, say 100 bucks or less, would be enough. Win 7 is still good enough.
If you can find a vector design tool for the tablet, then you can design on the go and cut from the shop. The vector app will have to spit out a format the cutting software can deal with.