Rich,
The other option is to try a 2x12-
I built a 2x12 loaded with Eminence 12's and love it. I guess 12's are a compromise between a 15 and multiple 10's, but I'm quite happy with the sounds I get from my 2x12 and it's a fair bit more manageable than a 4x10. All of the cabs I've built are listed in this thread (115, 212, 210). I'm not a pro- I play at home, in church and at outdoor church concerts and with a combination of the 3 cabs I listed above, I've honestly never felt as though I didn't have enough to get the job done (not including my playing ability, of course!).
I should have thought of that when posting the first time, but I'm often a bit slow on the uptake and the output end. =)
If I had to choose a single cab to play with from here on out, it would probably be the 2x12.....
Toby