Scott, thanks for posting the photos of your 90. As it turns out, I've just picked up a used 90 (thanks Shawn!) that I'm in the process of cleaning out. Its going to replace the 120 that I was supposed to get from Aquarium Adventrure.
Since I'm putting together a 90, I thought I'd ask a couple of questions about your setup.
What are you using for flow? Both for filtration and for in-tank circulation? I see at least one MJ mod in your tank. I was wondering how much total circulation you've got, whether or not you think its enough for what you've got growing, and whether you'd do the same thing if you were to start over.
as far as MH light recommendations go, I'm certainly the last person to ask about their experience, but from what I have read, 175W is more than adequate for keeping any tank that's less than 30 inches deep. of course, some people like the brighter lights, and will consider 250 or even 400(!) watts for a similar tank depth. i have seen tanks with both 175W and 250W bulbs and both have looked good with good coral growth. i have to admit, 400W is pretty darned bright. IIRC JRs's tank had 3x400W lamps with lumen brite reflectors, and that tank was really bright. wow.