I just bought the whole trans from suncoast and installed it myself. Thats really the best way to go cause they really now what they are doing and bench test each trans before it goes out the door. I did have my billet input shaft cryoed at a place called WOP but other then that its all suncoast.
If you have a dmax you can sometimes get by with a transgo jr kit its a easy install and as long as your smart it will last awhile. I had one on my old 07 lbz and it made a huge diff.
Yeah, I've read a lot about the transgo jr kit. I just recently did EFI Live on mine, so I want to do a full tranny. The cost is insane though!