I just bought a Gateway M275XL Tablet and so far, its amazing!! Just over the $2k mark however, at about $2200.
If you plan to use wireless at all then make sure you take notice of if it is equipped with the Pentium M or the Pentium 4M... the M has the centrino chipset that optimizes for wireless, runs faster/more efficiently and uses less power. The 4M is the old 4 with mobile stuff built on to it... it works, but is less sophisticated than the Pentium M.