Great! You have my sympathy about wanting to get water in the tank. It took what seemed like a century until the first live rock went in.
I would test the plumbing with FW first. If you have to empty it in a hurry, SW is messier and more expensive.
I am using a mag 9 with the megaflow in my 90. There's a ball valve after the pump, so it can be throttled down if I want less flow.
My experience with the EuroReef was that it didn't skim much during the cycle, but went completely ape when the live rock went in. I had to shut it off for a day or two because it was overflowing with thin skimmate, even at the lowest setting. After that, it needed a little adjustment to get the level right, and has been filling the cup weekly with foul, thick glop ever since.