It just so happens that my small tank is exactly the same size that you are considering. Right now I'm running a 150MH pendant with no actinics. Mostly have SPS and some softies. I've used this light for about a year now with no problems. Growth rates are all good.
Check out Phreezee as he had a nice (I think it's a Fishneedit) pendant he was going to sell me but it wouldn't fit the lip of my aquarium
This is the light I currently have. I'm going to sell it but I have to find a replacement first.
http://www.jlaquatics.com/product/mh...+1+x+150W.html