Good choice fella!
19s are a must, however I don't find the DCC worthwhile (personally), had it on my rocco and stopped using it after a few months.
Turbo is ONLY weak on the early cars, the later (2015 onwards) have a later revision which is much more reliable. TBH, there's hardly been that many cases of failure on the R-OC forum.
Your best doing stage 1 + an intake pipe (airbox to turbo). this combination gives around 375bhp. You need a DSG remap with stage 1 as you can get clutch slip without - 400lbft of torque is the root cause
Downpipe & stage 2 map is around 385-390bhp, then an intercooler to see you over the 400bhp mark