These are all ok options - BUT the Solar I is way over priced and ADA underpowers their fixtures, so you end up with less light output. The Aqua Medic pendant (I run one on a Mini-M Reef setup) is a good little light - but it produces a lot of heat and you would not get as good light dispersion as you will with the Tek - which is the best bang for your buck. The AM Ballast also starts to buzz after a couple of months.
If you are interested in a MH pendant, I have heard good things about these (look a lot like the AM, but way cheaper):
http://www.fishneedit.com/150w-metal...ndant-lig.html