Sean, if it were me, I would go with Aaron @ Driftmotion. A coupe reasons:
-We all know what the T67 flows. There are various compressor maps out there available. Just look up To4R. The TO4R is the journal bearing version of the To4Z.
-The T67 has cheaper parts when it comes to a rebuild. The MP70, no matter who tells you so, CAN NOT be rebuilt with Garrett parts. I've been round and round on this topic before with local former customers.
-Aaron is a great guy and his customer service is second to none. Plus, he's a fellow supra owner.