So been awhile, but I hate when people don't report back😂
I ended up with the Powerspirit gtx3576. As with most things it needed a bit of modding to fit it up. I think this is the case with all gtx's, don't quote me on that. Actuator bracket needed to be re-drilled and to line up properly with wastegate and stock turbine housing needed a tiny bit of 'machining' to not touch the turbine. But all went well and is installed.
No power figures yet however it is amazing. I'm running 16psi atm. Not really wanting to turn it right up right now while weather isn't great. The spool on this turbo needs to be heard to be believed haha. Instant boost, no lag whatsoever. Still fine tuning the wastegate DC and getting the curve right for this turbo. Upgraded the intercooler to the PW stage2 cooler as well. So nice not having to battle with ignition retard.
Thanks to everyone that gave advice and JET who came through with the atomic stuff making my life easier.