I'm going to upgrade my lightning system to HQI pretty soon..
I'm thinking 2x150W or 2x250W in a single hanging fixture.
Possible fixtures:

A-B Aquastarlight future
Bresslein Aquastar 2 or 3
Geissmann Nova II

What do you guys reccomend???

I want to be able to keep clams.
The lightning is for a 100gal.

Thanx alot!
-Thomas