mattiej, the lighting is actually the piece that I've been the most unhappy with in terms of my decisions. On my 75G system, I went with an off brand MH / PC setup and it was built great and has worked great. I did the same thing this time around. I bought an Odessey (Aquatraders) fixture which is a cheap system (3 x 250W MH, & 4x96W PC). All electronic ballasts. Overall I think it will work fine, but the build quality is not there. The reflectors are not great (very flimsy) for one but the overall fixture is not very solid. I was considering LED, but it is still too new and expensive at the moment for my taste. Plus, I just really love the "shimmer" that MH gives. LED's are supposed to be close, but I don't think they are there yet.
My plan for now is to stick with the fixture I bought and maybe do some sort of DIY lighting project later. Maybe LED. We'll see. I'll need a new project later anyway once all this is done!
Check out James's build thread. He is working on a 225G, so it's close as well. I think he has a nice lighting setup.