Always fun building new systems.
Well, lighting. The 14k rating is a bluer and less intense than you might be use too. Have you seen them in person? I've got 250w 14k if you want to swing by and see them. I actually run them with Iwasaki 65k and like the combo.
Flow, Tunze's are great. Sounds like you have it planned out pretty good. If you are going with dual 2" drains then you might even want the Ampmaster 3000 for fun.
Calcium, alk, and trace minerals. A large reactor will be a must. Having a kalk reactor inline with your top-off will definatly help out with the demand.
Skimming. Well you know I like the big Bullet skimmers but I am bias since I haven't run mazzi or even seen one in action. They are quite easy to build and can save you tonnes of money if you have the time, tools, and materials to DIY.
Sump. Are you having a tank room behind this sucker?
Lots to thinkg about eh!