is by having a Cabin ala Mike Garside and Magellan Alpha!
All joking aside, a RIB will be a lot drier, a lot more capable, a lot more comfortable and a lot more fun than a Dory. What you will find is that as your confidence increases you will go out in rougher conditions and try just that little bit harder until you really manage to cock it up and stuff into a wave. At this point you will be completely soaked but smiling!
In this country most of the time you will have to wear some form of weather protection. Ribbing is something like I motorcycling inasmuch as it can be a bright sunny day but when you are doing 35kts with little protection you need a few more wind and waterproof layers on! You'll see people in RIBS wearing anything from sailing waterproofs to full drysuits depending on conditions. What usually happens to me is that I decide that its not rough enough to need my drysuit and promptly get a large dollop of water down my neck and spend the rest of the day being damp and uncomfortable.
There is a huge amount of advice here on the forums on boats, equipment etc. The only thing I would really advise on in RIB selection is make sure that a) you get a proper Deep V RIB rather than a medium/shallow V and b) it has proper jockey seats on rather than benches. They really do you no favours in the rough.
Charles is your man on all things South African. He just needs to sell that hairdressers gin palace of his and get a proper boat again!