MH watt selection?

[whitetiprs]

I am planning on upgrading my lighting and would like to know if I should go with 175 watt or 250 watt MH. My tank is a 46 BF which currently has a single 150 watt MH and 2X 65 watt acintics. I will be upgrading to 2X 20000k MH with 2X 55 watt 10000k CF. I currently have a mixed reef but I am in the process of building a propagation system so most of my softies and LPS will go into that and I will be left with my SPS and some zoos.

So should I go with the higher watts since it is not that much more expensive, Or will that much light be over kill?

 

[theatrus]

If you're going with 20k bulbs, I'd shoot for the 250W. 20k bulbs have less light output than 175s.

Its not much more expensive except in utilities