Yamaha DTXpress/DTXplorer/DTXtreme

I'm a new member.  I'm looking to buy my first drum set and have
decided on an electronic set because of space issues and my
embarrassment at having other people hear me play.  I do have a very
limited budget.  I tried 3 electronic sets out at guitar center
yesterday and liked the Yamaha Explorer best.  New, however, it's out
of current price range.  I tried the Simmons, and the Roland starter
set (where the pedals are part of the base.)
Any opinions or help on how the Yamaha compares to other sets -
Alesis, ODP, etc.  Anyone know anything about the Yoki I see on Ebay?
 Anyone know of anyone trying to get rid of a DTXplorer cheap?
Thanks everyone.
Patti Buhler, Kearney, MO