Here's a bolt/weld in kit that goes to the dash with an optional floor mount:
http://www.orfab.com/Sportcage.htm
I couldn't use one designed to work with a half cab because I'm too tall and would kill myself by blunt trauma.
I like this one because I need one that goes all the way back to the stock rollbar (or replaces it, but then we're looking at big $$$ custom cage stuff)
I like their rear cage as a start to a full cage, but, as they say on Pirate4x4 "Needs triangulation" I think it would be pretty easy to add the needed strength to it, but then I wonder if it's as much $$ and trouble as a custom cage...