Sump is a great idea because anytime you can increase your total water volume the better.
The skimmer is a good skimmer and I have heard many good reviews. I have a mag pump and love it. I am not sure what a "Megaflow sump fitration 2" is so I cannot comment.
Welcome to AA!
65 gal reef
2 PC's 192W each , 20 gal sump/fuge
4 false clowns, 2 firefish, cardinal, midas blennie, toadstool, zoos, shrooms, trumpet coral, torch, pagoda, frogspawn, poylps, red open brain, devils hand, hermits, snails, 3 cleaner shrimp, coral banded and a emerald crab.