Eric~
In your shorter tank I think Maxi-Jest are going to be your best bet. Other good ones like Gemini are just to powerful for any tank under 6' long.
If you want to add some real current to your tank as I see you are looking at those 12 SPS frags on ----, you might want to try a surge devide to augment the powerheads you already have. I should give you some nice variation.