HTC Sense 4.0A build 8 by derefas is great and smooth and has been stable in this forum for quite a while. The bug it suffers from is random reboots when a lot of RAM is in use.
HTC Sense 4.0 lite build 8 update 2 by shekhuntawar is relatively new and is as stable. The bug it faces is that the screen will not turn on when you receive a call while charging your phone. You have to disconnect your phone before picking up.
Take your pick