I'd love a big one, but I'd probably go with something like the Bamboo Capture until I could properly use it and appreciate a bigger one. That one's new enough it shouldn't have problems, right?
The trouble is big Wacom tablets are expensive. You can buy used serial Wacom tablets cheap but be aware that in my experience you will need to use a legacy version of Windows to use it, in my experience anyway. I have a large ancient tablet but have never gotten it to work with Windows 7 64 bit. It's serial so i had to get a serial-to-usb thing to even try -- supposedly it can be done, at least according to reports on the internet, but I've come to the conclusion that all of those people are talking about 32-bit windows and gave up on it ... still have an old XP box that I use for a couple of things, this being one of them.
: Removed un-needed nested quote.