Just to give you some background, I've had four Tablet PCs in my life. My first Tablet PC was an Acer C110 tablet that I found in the basement of my apartment building, but which unfortunately had a motherboard fried from water damage. The C110:
My next Tablet PC I bought in Freshman year of college on eBay, a Toshiba m205-s810.
In the summer between Sophomore and Junior year, I bought a Gateway CX2620, a truly massive machine that unfortunately used active digitizer pens from (not Wacom) requiring non-user-replaceable batteries rather than the transductive pens that Wacom-based digitizers use that require no batteries. The machine:
My current tablet is an HP Pavilion tx2525nr, which I got for $700 on Woot. I've been very happy with it, and I think it's almost lasted the longest of any of my tablets to date.
I've really enjoyed my tablets, and it's almost time for me to pick out my next one. I'll either edit this post or repost when I start preliminary research. Mexi, what are your primary criteria?