The Promethean gets a lot of love from those with one (or who's tried em also, I haven't).
Another option would be to get shot of those cabs & replace them with a decent 2x10 or 2x12 from the likes of Markbass, Bergantino, Schroeder etc & just keep your head & then when funds allow, replace your head.
Or... If you can stretch the extra £99, there's a Markbass 2x10 combo the same as mine (except it's newer) in the for sales. Brilliant combo that's plenty loud, but will it be small enough? :insure:
Have fun.