ricks thanx.
Right now everything is pretty vague, since I have yet to find a house to move to and see what's a good size depending on the space i got.
But overall, I think my goal is to have a 72x30 (or 36) x24 with 3x250HQIs (maybe 4). The return pump is a Dart or the next bigger one. Everything else doesn't add much heat (Tunzes, skimmer, etc), no closed loops.