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You will be somewhat hard pressed to find a canned TT C6 kit that will make 1200. Best bet is APS with DKT turbos. But APS doesn't make the kits anymore either although you can find used ones around.
I know a guy in Houston who's been trying to sell the hp performance kit at auto adrenaline a while back. His name is Wally I'm sure he still has it give him a call.
IPS has a kit they jigged on my car that can support 1200rwhp. It's very similar to the APS kit with a slightly different layout and a single intercooler.
My twin 62mm turbos have made 1073rwhp and they can up that to 67mm if you need.
I own an HP Performance Kit and I was able to hit 750 RWHP on it with an LS2 402 with stock LS2 heads, 57mm T3/T4 Turbos and the standard 2.5" downpipes. I'm taking the kit and the car to a new level now. I got a set of PRC 237 heads, 102mm FAST Intake and NW TB. Also thanks to Devin "Z06-TT", I got a pair of PT7675B CAE, PW46 Wastegates and a set of TiAL 50mm Q Blow off valves. I'm going to post up a thread about the upgrades later. I'll have to weld a T4 flange instead of the T3 one. Also I'm going to make 3" downpipes.
I believe in the potential this kit has and I'm going to find out where I can reach with it. I'm ready to help if you need more info.
I have a custom twin kit i might sell. V band 62/65 precision ball bearing turbos,3in downpipes,twin precision air to water intercoolers,water tank, ron davis heat exchanger,dual meth nozzles,etc. etc. Makes 870wrhp on my cam only ls3. 93 pump and meth. 14.3 psi. Kit will make 1200 all day long. Can fit 6766's if you want to get silly with it.