As much as I like Peavey it's hard to beat those little Ampeg BA series combos cause they do Ampeg thing so well.
Which Rumble did you compare the Max 112 to?
Also did you have a chance to try the Ampeg BA 112 that JimmyM suggested by any chance?
I found I liked the tone of the BA112 probably best of all the BA series, and would rate that combo up there with the venerated Rocket bass amp series, it really is a good sounding combo.
Anyway, congrats on the purchase, the 115 is a heck of a practice amp, it will certainly handle small - medium gigs as well.