Yes, I use alot of HS55, good deal for the price. But the HS65mg are even that much better.

If your just learning, then HS55 will be fine. And yes, you probably will break a couple along the way. Fortunately, most breaks occur in the gear sets, which you can get spares for. 1/2 the price of the original servo (like 5 bucks), but better than replacing the whole thing.

Yes, better to have a matching set (3) on the cyclic.