Hello. I'll be ordering a Walkabout 12. It'll be the 8 ohm version. I'll be using it solo for practice and small gigs, and I can't imagine that the 4 ohm driver in there is going to make much of a practical difference. But I'll need an extension cab as well for the bigger stuff. Does it make any sense to deviate from the standard 112 scout ext. cab? Would the 15" be an inprovement? Maybe the 12 @ 8ohms, and the 15" @ 4ohms? Or how about pairing it with something different, like say a Berg AE112? Sadly I have no way to test any of these combinations. Any input appreciated.