Lighting options.
There are some other options than the two you've identified. I imagine the Aquamedic is cheaper because it has two less bulbs, that is unless you meant the 4 bulb version.
My LFS has brought in the wavepoint fixtures (an asian brand but one that appears to be of pretty good quality....individual reflectors, completely sealed unit) Here's their site:
http://wave-point.com/Lighting_folder/FixtureMain.html
You can order them from
www.aquacave.com as they ship to Canada or inquire at your local LFS. If mine gets them, I'm sure any stores can.
Another option is the Aquaticlife fixtures. I don't know much about them but the "House of tropical fish" an online retailer in Ont. sells them (as does Marine depot) and if you search here, you'll find some reviews.
Finnex also sells T5HO fixtures...theirs include LED's. Aquacave carries them too as do a few Canadian retailers.