Have you dropped your mounts yet? They will take the 2" extra height out the springs and give you back full articulation, if you then +5 your shocks you will get some pretty extreme articulation. You will need cones (or sliders which are meant to be better) and probably double cranked arms as well. I have got straps on my rear mounts as well so if I can get a puncture I can lift my rear axle with a hi-lift otherwise you will keep jacking the body and the wheel will stay on the floor. As has been said you will want the bump stops e.t.c. and as far as I understand the pin-pin are the better setup for long travel. If you had mounts and shocks I would expect you would need a wide angle ball joint as well, X-eng do them for about £35 I think.
Gotta agree with Tusken as well, my DeCarbons have been on a year now and have done well, not too soft, not too hard, hold the road well e.t.c. I only hear good stuff about OME mind, they are very big in the US and oz...
Have a look here, this is what an extreme kit consists of, might giove you some ideas
Extreme 4x4 Ltd EXTREME KITS