Rob- I'm thinking about going sumpless. An idea very similar to what Mike has done. Here was my concept drawing:

new tank - Cube Tank Owner - Shout Out Thread

For lighting, I'm thinking about going with a single halide. I just would like some sort of dusk to dawn. I like the look of the "disco" light that current offers, but I'm not sure it will give enough light for a 2x2 tank (haven't entirely ruled out the solana tank, but I'm afraid I might not be happy with the size).

solana sideimg - Cube Tank Owner - Shout Out Thread

I also have put some heavy research into LED options. But I'm not sure I am comfortable enough with the longetivity of the technology to pay the premium that it costs.