I bought a 2011 Renegade 800R and love it. Yes it's expensive but what a ride and what a rush! With 4wd to boot.
Now one if I went with a 2wd quad it would have been the Honda 700XX. Now I know it gets a lot of bad rap for not being as fast as a Raptor 700, but the independant suspension would make up all the difference in the world when it comes to trail riding. The only hard part is finding one of the 700XX's. They only made them a few years but you can find a nearly new machine for around 4-4500.
The independant suspension on my Renegade is incredible. I bought my wife a Suzuki LTZ250 and while it is a nice little quad- the ride difference is like going from an escort to one of the new Cadillac CTV's.
I have heard the KFX700s have nice power too. My vote would be for the 700XX for 2wd or find a used Renegade 800R if possible.