I think Ofna makes some great stuff. Also check out the
Axial Yeti XL, not quite a monster truck, but a monster buggy/rock racer. As of the end of 2014 came, Tower Hobbies no longer is distributing the brand. Which makes no sense to me.
Thunder Tiger now makes the K-Rock MT4 to go along with the KAISER eMTA. Not quite sure you can still find them around or not.