I have been looking as well....I have a Fabtech 6" lift on my 03. I have looked at the Fabtech setup, Cognito set up, Fox shocks, Bilsteins, and on and on....and I guess it just depends on how much you want to spend.
I read the 06 and later upper arms are weaker and need to be replaced. Here is a set up that looks pretty stout-
http://www.teakatoys.com/Hummer_H2_P...fts51010bk.htm
Or, you can go with Cognito who has nice upper A arms for dual shocks, and the hoops and shocks for sale...
I think after much research and debate, I go with the kit above with Fabtech dirt logic 2.0 resivoir shocks. There are tons of options, and Fox shocks can get really expensive for the sexy ones.
I have decided to stick with Fabtech, except for my tie rods, which I am going with supersteer HD tie rods.
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2003 H2, 408 CI, K1 Forged 4" stroke crank, K1 6.125" forged rods, Wiseco X-Series 0.30 forged pistons, Schneider cam, FAST 102mm LSXRT, precision flow injectors, Comp Pro Magnum rockers, SA Gear DR timing set, ARP main studs, 90mm ETC TB, Airaid MIT, MSD Coils/wires, Dynatech Headers/high flow cats, Magnaflow, Jessie James Black Widows 20x9, Nitto Dune Grapplers 37", Fabtech 6" lift, CK Performance XHD 4l70e and 4.56 Gears