Ah ok so you are looking for a mid-priced and mid-sized tablet. If you want one in the $500 (USD) range, I would recommend the Intuos3 12x12 tablet my wacom.
Link located here >>
Wacom
And if you are looking for a top of the line tablet, I would recommend the DTZ-2100 tablet also by Wacom.
Link located here >>
Wacom
Although I do not have these exacts products, I can attest that all Wacom tablets that I have used in the past work well and are convenient to use.