DKG is not simple called the AT here? Thats the automatic with the torque converter.
DCT is the double clutch dry automatic gearbox. But thats called DCT in the EU as well. No?
Anyway i have the simple automatic and it works fine with tune, and Terry has this automatic tuned up to over 500whp and it still holds.
There is a guy here in Budapest who has the DCT and JB4 and it also works fine, the power is not to much. I think up to 400-450whp the DCT should be fine depending on driving style. Of course if you drive like me than you can kill the DCT with the stock power also fast...

Wiht the JB4 and a really good car you will max out the car on 360-400whp, so no worry's...