I recommend you go out of your way to fill the fuel tank, fill the bait tank(s), load up 4-5 people and some gear to similate 100lbs of ice and all gear, and go out in at least 2-3 foot bumpy seas to see if you are going to like the props you settle in upon. I can run A5s over 3900 RPMs with 3/4 fuel, one person, and no bait. But the motor really has to push to perform close on A4s fully loaded. I almost could even go down to A3s if I didn't want the speed coming home when tank is half empty, bait is gone, ice is melted.
As for A or B vs. C series. I really wanted to go with C series as well. But the B props I used last year cavitated sometimes in quartering swells. The A series with 4-blade rear hardly ever cavitates and runs so much better. C series only comes in 3-blade. I would like to try C if they had a 4-blade rear.
Glenn (Wizard)
"The Reel One"
26' Billfisher