dont forget Just Engines Leo 37 SF, 50 quid, cheap as chips, more power than the new Governor of California. however it's still got chinese bearings at it's heart, mine lasted 1.5 years and a HARD life, very good for chinese bearings, 7 months and 100's of flights over my old magnum engines..
the OS 32 will run forever tho. your cash, your choice. the 32 will be more floaty and more than powerful enough. Always Weston throttle pipes if you want more.