I would go with the coralvue ballast, lummenarc reflector but for a bulb I would use a 14K 250w Phoenix. I have a galaxy ballast with lummenarc pendant and 14K 250w Phoenix (cost 400$ new) and I can not say enough good things about this bulb and reflector, its very blue and crisp for a 14k bulb.
Probably seen this picture before but I'll post it again, its my frag tank with the above combo on it for lighting.
And a up close shot
Thanx
Sean