Prop suggestion needed for PT-18

[printman71]

My son is about to be the proud owner of a new Crestliner PT-18, with a 150 Mercury Pro XS (4 stroke). It will probably have a jack plate and power poles added before very much running is done.
What prop would you suggest? I'm thinking something like a 22 pitch, 3 blade, but that is really a guess. I've only had glass boats and most have been 20'+ with 225 or 250s on them.

[gordonsweb]

go with a 21 inch Solas it will run mid-50's. That's what my dealer has been putting on these with regular 150's.