My name is Justin and I have been diving for a few years and just started taking photos underwater. I am currently shooting with a SeaLife DC1200 but having some trouble getting the most out of it. I spent this summer as a biology research assistant in Wakitobi, and had a blast taking photos in the reefs when we had chances to do non-science dives. I also own a Nikon D90 which I use out of water, but don't yet have the money to buy a housing and strobes for it. Any recommendations as to what company's housing to buy, and what store to buy it from? I would now be able to survive my dSLR flooding!
I used to use a G11 with the OEM housing. I got a Fantasea BigEye Lense which I was horribly disappointed with due to the flaring and clarity (pay peanuts get monkeys...). On top of this the G11 Macro function only works when you are zoomed all the way in. So I was basically stuck unable to go either wide or do close enough with the OEM housing. I started shopping around for other G11 housings that could fit other lenses such as FIX, Recsea, Patima etc.. and found that I was going to pay in the vicinity of $2,000 for the new housing and addons.
As yourself I was also using a D90 for topside and I decided that for a $2,000 budget I could get a housing and macro port for an slr housing. I added a bit to my budget and to get a 60mm macro lens as well. After shopping around I ended up getting an Aquatica AD90 from Backscatter plus the 60mm marcro lens. I will have to invest again to get the wide angle going but I have my hands full with the new system and very happy with the results, the quality of images and no shutter lag with an SLR. Just a note on Backscatter since you are asking for recommendations; I am very pleased with their response time, advice and service.
Even though it was a pricey to get the system, I have no regrets with the decision and would encourage you to take your D90 underwater...I am actually only really getting use out of mine since taking it underwater. I trust that when taking time in setting up the gear, o-rings + dunking it to check for leaks before diving that you should be alright.
Hope this helps in your decision!!