CANTCU AFAIK requires specific gearboxes, not just any 8HP, so be sure about that first.

Turbo Lamik I think is a CAN based controller that also runs the box without wiring modifications from what I gather, which is a very popular choice.

HTG that Mark uses, you must re-wire the box internals. That has some pros, and many obvious cons. Some people seem to love the HTG controller....some hate it.

DCT would still be a very viable option for you, especially if using MaxxECU, as it can directly run the box without any other nonsense. I don't believe they can do the 8HP like that yet.

8HP's are just available everywhere and quite cheaply. And must admit I'd prefer a torque converter auto like that myself if doing such a swap. I'd love to, I'm just not convinced any of them would be strong enough for me to take the risk.

Motec.....don't like that M1 platform at all.