id go for crd, u just have to look at the cars that come out of that place to know they are serious about what they do, they are ment to be the GTR experts, plus they have a 4wd dyno which helps more and they dont stuff around, they get in and get the job done.
ive used them a couple of times now n i couldnt be happier with the service from them, even tho its n hour n abit drive to get there, i wouldnt go anywhere else now