With that great 120YS engine you have many options. Here are a few I'm familiar with:

1. Velox RII www.maxairrc.com (this is a scale bird that flys way better than a F90)
2. Mayhem 90 (fun aerobatic 3D plane. One of my favorites but not scale)
3. Showtime 4D (Looks pretty scale w/o the SFGs. Flys very nice)

Just my thoughts. The Velox wouldn't disappoint you in any way. It Knife Edges the best of any plane I've ever flown. No coupling. It would hover all day with a YS 120. Weight would be right at 9lbs with that engine. Does a nice flat spin but no rising flat spin. Waterfalls are excellent with the 120. It would do anything a F90 would do only better. It Harriers nicely with very little wing rock if you use a touch of spoilerons. Rolling circles are harder but doable. I'm pleased with mine. I wasn't pleased with my F90.

Thanks
Barry