Wow, that thing is quick!
I have a Exomag Limb model(no wheels) from Excaliber, bought in '02
It is plenty fast @ around 325fps.
It has taken 5-6 deer. Very accurate.
If you cannot find what you are looking for, I don't think you will go wrong with any of the manufacturers these days.
Dicks and Gander Mtn. have packages for as low as $200+.