I have the hks 2835 pro s turbo on my car. Happy enough with the power. Most I've had it at is 267kw @ 15psi. Didnt want to strain the turbo too much after blowing my last one. Happy with the power and the lag.
Also as far as im aware hks have now brought out the 2835 kai turbo, which I believe is an improvement on the pro s. If you really want the 3076r I'd talk to Mick as well, as he is running it on his 25.
edit: one of the reasons I went with the hks turbo, was apart from the heatshield it pretty much looks factory, and is a direct bolt on.