Which Tablet is best for Zbrush ???
Ummm, do a search of the forum, that horse has been flogged to death. 
Several threads exist, very long, and your request is not going to get you a result as you have not defined the necessary parameter.
Do a search…
If you chose Wacom then invest a few bucks more as the Intuos has some settings in the drivers which make it behave properly. Afaik the lower versions do not have that entry in the driver. And yes, search the forum. I bought the 16:9 Intuos which is great if you have dual monitors. Price is also great sighhh. But wihtout it, I would not know where I should place my ice tea on my desk.
Lemo
Cintiq 21UX.
http://www.highend3d.com/articles/reviews/16.html
http://www.wacom.com/lcdtablets/index_21UX.cfm
Volito?!?! I haven’t heard of that one. A quick check at Wacom’s site suggest it’s just like a Graphire (Which I have). Is there a difference between the two?