Just weighed mine with my new 10 lb. digital postal scale.
8# 3.2oz. with a TT FS91 and 15X6 Zinger.
(I made some lightweight foam tires for the WM wheels. They're lighter, bigger, and softer.)

I was using a 14X6 Zinger but it didn't seem to be enough prop for the engine.

Most people with the O.S., Saito, and TT engines are running one of the following:
13X8
14X6
14X8
15X6

The 14X6 is probably the best place to start.

You will absolutely LOVE to fly this plane!

Jazzy

Oh yeah, keep your control rates down at first - it is very responsive! And to keep the nose-over problem down, put two or three small washers or 3/32" angled ply under the trailing edge screws of the retract gear. This will increase the angle of attack but will not affect their ability to retract into the wheel wells.