I converted my BVM F86 ducted fan over to the 750 several years ago. The current kit is even better suited for the turbine use ( check www.helijet.ca projects section ). Many are flying with the P80 / P70 I would suggest that you also look at the Trim Sabre. Slightly larger it too flys well with the RAM 750. Charlie Hissom out of Spokane WA was sure having fun with his last summer.
Another one to look at is the Fibreclassics F86 ( Composite ARF ? ) - although I do not know if it is in production.

Regards

Dean Wichmann