Ketchup, it's really not that critical, but I'd err towards the higher power side if you have a large room and like to crank it up now and then. If I recall, I think the 3.5s use active bass equalization, and if that's the case, the bass will tend to drain a lot of power from the amp...
Did they come with any kind of electronics that plug into an AC outlet?
Did they come with any kind of electronics that plug into an AC outlet?