Raymarine C70 or C80??

Big difference in price and some good offers about but how do they compare in practice given the different display sizes? Anyone offer some thoughts on which to go for please? Can the extra cash for the C80 be justified?

I've also sen some offers which include radar domes for the C70. Are these suitable for a RIB? The P22 has a decent enough A frame but is it high enough to make the radar effective?

Cheers
Joe

Bigger is always better in this case. I have a C80 and it's great - wouldn't really want a smaller screen - look at both next to each other and see what you can live with - you can always add Radar later.