wow, thats looks absolutely awesome. i really like the color of the stain you chose.
the lights look great. what others were trying to say earlier is that you can buy retrofit kits. this means you can buy reflector, bulb, ballast, socket and wire them yourself for alot cheaper. you can get the exact same quality as a pre assembled lighting assembly. for me, fixtures are for open top smaller tanks. when you have a large tank with a canopy, you can use retros and get the same quality for alot less. the only downside is they arent as attractive, but like i said, it doesnt really matter when you have a canopy. but reguardless the lights look great and if your happy with them, no biggy.
also i was wondering what you planned to do with the top. i can see that the setup lies flush with the wall but theres a gap at the top. do you plan to drywall that in?
keep the pics coming.