The Extra 300 is fast and agile,all you got to do is find one that is suitable for your engine and is a quality airframe that is not heavy.Extras can 3D well,but also can run a few quick laps.There arent many out there in that size,that have bigger controls for slow 3D,you wil really need to search around.
You will probably have to make your own linkages and use top end servos to take the punishment.
The Fliton Extra is a good example,but is a bit small for a 90 2 stroker.Whats your elevation?