I'm currently sourcing a 34 through J-Spec (car has been purchased, just waiting on a boat) and can't say that I've had any concerns whatsoever.
I chose J-Spec over Prestige (who I would also recommend) simply because they're in Melbourne and I've met the guys, and the cars they're brought in, before.
Just be prepared to wait a couple of months (no matter who you choose) - gone are the good old days of getting a car imported and on road in a matter of weeks.