Welcome to WAMAS. I have been a member for over a year and have really enjoyed it. You'll receive lots of help fromt he folks here. Just a note, update your profile with your approximate location so folks will know where you are.
To your questions, of which I only have positions on a few...I am a pro-sump, pro-drilled-type overflow tank builder. There is lots of reference to the success of hang-on back filters, protein skimmers, etc., but your got some big tanks and in my opinion you're gonna need some big flow.
One of the best parts about WAMAS, however, is the variety of experience; so you'll probably hear from a bunch of us. Good luck.