I'd go MoTeC every time, their support is second to none.
What are you looking to spend?
MoTeC ECUs have a good resale value, should you wish go get rid of it in the future for something more up to date you probably wouldn't loose too much. Personally the minimum I'd look at would be M600, M800 then the latest M130 ECU.
Do you have a mapper in mind? If not, it would be worth contacting Fraser MacKellar (MacKellar Racing) who is a UK based mapper but travels. IIRC he had a Supra so you know you it wasn't mapped then left, it would have been constantly tweaked He is very busy but is certainly worth the wait.