Depends what you want it for.
Are you a drummer?
Do you want a nice feel when drumming or is price more important?
Do you have the space for the whole thing? If not, why not go for a SPD-20 or something similar, there are cheaper Alesis versions about.
If you tell us what you want to do with it, we'll be able to help ;-)
To tell you the truth I will not be playing them that much ,(but I will of course) but I know a few drummers and I want to mine their talents for recording, ideally they would be playing the drums with the midi out going into my soundcard (M-Audio Ozone) and assigning it to a drum vsti, hopefully anyway thats the plan. thanks in advance for any comments