Well, to deal with the heat, apex control, and the desire for some led lighting issues together, I think that leaves a a dimmable t5 unit with a led supplement bar for that size tank within your budget. That or a used led setup .
I would look for a used dimmable t5 fixture and then a new or used supplement bar. The ReefBar Pro looks interesting for a reasonable price and there is a blue/white and a full spectrum choice.
Good Luck