So the MA3's are a good solid rim. I've been riding a set for over a year now and they've held up just fine. I know the Open Pros are slick and all, but they look about the same and the MA3's are plenty strong enough that you won't regret lacing them up.
On the other hand, the Superbe Pro's are nice hubs and you could be excused for splurging on some flash rims to go with them.