I run 250W MHs and the Geismann 13000K and have no complaints about my SPS growth or colour. I'll probably repurchase this bulb next year. Unless your tank is crazy-tall, the 250's should be just fine....especially since you already own them.
I also run 54W actinic T5.
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank: http://www.canreef.com/vbulletin/showthread.php?t=28436
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