Hi, this is my fisrt post so go easy on me

. I've been lucky enough to be posted to California for 3 months with work and I figure you cant come to CA an not surf. I was gonna
buy a wetsuit as I plan to really get into watersports in a big way and I was looking at the O'Neill Mutant 3/4. So the questions are:
1. The fit is good, anyone else got one and rate it?
2. If i buy a 3/4 will that be too hot for pacific waters and will it be warm enough for the North Sea when I get back to Scotland?
3. Total dumass question but what do you wear under your wetsuit, speedos?