Wallary - Tango Down makes a good front vert grip. I'm pretty sure I've not seen anything bad about the GG&G models either. As for lights, the best advise I have is to figure out how much you want to spend and look at what Surefires or Streamlights are in your range, go from that.

XHairs.. thank you! I've been looking for a straight answer on the shroud twisting and such.

Anyone know anything about the Surefire FF rails? Does anyone have any experience with the YHM front gas block/flip up sight and gas block combo?