6" teraflex = 3" any other lift. Just sayin.
Like many on here are saying, check out Rock Krawler. Depending on how you wheel and what your plans are, there's a RK lift for you. If money wasn't an issue and you were looking to set yourself up with a very nice on and off road rig capable of most things you could throw at it, I'd look at the JK 3.5 X Factor Plus System.
It has a very stable 3-link rear lift as long as you go with something like a Currie AntiRock on the rear to replace the stock swaybar. This is one of my favorite RK lifts and the more we install the more we like them. As far as streetability goes, it handles very, very well.
Don't skimp on shocks, get the best quality you can afford. And for the rears get the relocation bracket so you can raise them up and cut 2" off the bottom mount. Also pick up a Poly Performance rear long travel upper shock mount. This will allow you to keep the travel of your rear shock after raising the lower bracket.
If you set the bumpstops up correctly, you can run 37's all day long, no problem. Running flat fenders is the way to go so you get max travel out of it too. Flat fenders will also allow you to run even bigger tires than 37's but you will have to adjust bumpstops and do some trimming of the body here and there.
And lastly, give Marcus a shout at River City Offroad. He's the most knowledgeable dealer of RK stuff on the internet and he's also a hell of a nice guy. He won't steer you wrong and he won't rip you off either. So do yourself a favor and give him a call before you order anything anywhere else. You'll be glad you did!!