Phlebas said:If you love 3,5e - stay with it!
If your moving to 4e - enjoy!
if you want to tweak 3,5e without going to 4e, you could do a lot worse than pathfinder
This. There are good ideas in all three of the systems, and I would expect most could find something they are happy with in one of the three, or a combination of ideas from one or more of them.