I had a Magnum 90 RFS in a BTE Venture 60, which is similar size/weight/aerodynamics with a Tiger 60. It flew the V60 with all the authority you'd want, produced lots of power, idled reliably, and would do any /loop/roll/spin combination I could dream up. I have no doubt that the Saito/OS engines produce a tiny bit more power, and are physically more attractive, but I think you'll do very well with the Magnum (or TT) 90, and have $50 more in your wallet.