forget E7001 , V7 has the advantage of multi boot so you can watch everything in ubuntu. it is not laggy in android compartment anymore, thanks to a final 2.1 release which makes it actually working, android is working on it as well.
as for wise e81, it is a piece of tech , but 256mb RAM means a hypothetical android 2.2 would not work so great , but it's your choice in the end.
these guys:
http://mp4nation.net/blog/2010/08/in...g-the-midnite/ rebranded it ,and have a good community and top notch service. for under 200USD its a bargain, i got my v7 at around 279 , shipping included.
cheers