When I was thinking about my equipment list for my new tank that I'm setting up, efficiency was very important. I ended up with a RD return pump that is going to run a manifold. By doing this I've eliminated excess pumps, extra heat that might necessitate a chiller, and of course electricity. I'm was going to go with a BK skimmer but ended up using the the RE cone which also utilized the RD pump. My tank itself was custom made and I decided on a shallower tank partly because of decreased lighting requirements. I'm planning on a mixed reef using 2 250w MH's, 2-80w T5's, and 2-24w T5's. I basically chose everything I could that would help lower heat and electrical draw. I haven't set it up yet but i hope to avoid having to go with a chiller.
I didn't go with LED lighting because of a few reasons. It is still unproven in my opinion, not too many people are using them with SPS. The reliability, I've seen way too many problems with them to justify spending $8000 on lighting. That leads me to the main point, price. They are too expensive, it would take years before breaking even and that doesn't even take into consideration any repairs or replacements that would be needed.