240V without question. It will heat faster and maintain temp better.
For sanitization, either go with a salt water system or the Frog@ease system. Both systems will be less maintenance overall. The con to that is both systems will cost more over the long run than a simple chlorine regiment.
There is a very vocal group that is anti anything except the old dichlor-chlorine regiment but in reality, if you are looking for something easy to maintain and don't mind the fact that your opertating costs are more but you have less work then the Frog system is what you need.