This is a hotly debated topic and many opinions circle about what is enough, what is too much, which spectrums are required, etc. etc. Seems though that you are well with in the ball park. IMO
this seems like a fine system for a FOWLR
tank with 28" depth (assuming that the lights cover the full length of the tank - you did not give all dimensions). Great price as well. You may want to ask if the bulbs can be individually controlled - that way you can nicely simulate sunrise and sunset with such an arrangement.
Bulb choice is good as well.
As for Power Compact and Compact Flourescent - I believe they are one and the same.
You may want to consider Power Compacts - check www.ahsupply.com
the 4 unit 384 watt unit is about $215. Their reflectors are really great.