found my new tank

You almost have to plan your plumbing around your rock work. Aesthetics should go hand in hand with functionality on a tank this large. You're going to have to don a snorkel and face mask to move around any rock in the depths of the tank once it is full LOL. You want to get it close to how you envision it the first time around. Get a rough idea of how you want the rock structure to look. Then figure out how you can work in a closed loop system, and keep it relatively hidden.
Are you putting this right up against the wall on the 4th side? Or are you leaving some room there. If you're leaving some room you can pull the intakes from that side of the tank next to the overflows, then hide the plumbing behind some trim work. That leave's less holes and plumbing through the bottom, and less things to hide in the rock work. That would be the way I would go, but not knowing how everything is set up I don't know if that's feasible for you.

As for pumps, there are lots of options. But the most economical will be DC pumps. Adjustable speed, and low power consumption. Jason (deadfish) just bought a speedwave DC pump. We should see more DC pumps with more options in the near future including ones that can be controlled via an external controller such as the APEX. Really opens up some awesome flow options.
Besides DC there are dozens of pump options that will work for closed loop. Dart, iwaki, blueline, all good pumps. Someone else will probably have to help you with figuring out how much flow the pump will need. That will be based on plumbing size and number of outlets.

 

What a beast. My back hurts just looking at that. At 968 pounds you're going to need more than one person per side.
I don't know how your house is laid out, but finding something similar to this http://www.northerntool.com/shop/tools/product_1037691_1037691 might be the safest way to move the tank and get it up on the stand if it will work.