starting the 125 gallon setup

[TheReefGeek]

If you really want a nice setup that you can use to upgrade down the road too, then I would definately go with 250w halides.

Don't use a Dart on a closed loop, too much flow. Use a 400-500gph pump, maybe a mag7.

I run a baracuda on a closed loop manifold with 7 x 1/2" loc lines, I am happy with it, but it depends on your setup, mine is hidden in a fish room so no problem about PVC all over the place. I like being able to tweak my water flow whenever I want. The vortech pumps look awesome, aren't they really expensive though?

Also I would consider upping the skimmer to a g4x, or bigger. Whatever will fit under your stand. You can't really overskim, and you can upgrade to a bigger tank, or add tanks to the common sump down the road then.