Weber sounds interesting, but I wouldn't know where to begin with options!
Yea, I know what you mean. On the plus side, Ted's always willing to talk speakers. If you tell him what you want in terms of sound, he'll make a good recommendation. They make a copy of the Jensen C15N (15F150) and P15N (15A150) which would be suitable for the B-15.
It is interesting to note that Weber will soon be coming out with an amp kit based on the SVT (called the AB-200). There will be a 10" CTS Alnico clone for their 8X10 cab. Maybe a B-15 kit will not be far behind.
I have a vintage ceramic Jensen Concert series speaker (EM-1500) that sounds really nice in the B-15. I was told that it is original to the amp. I've seen a couple of Ampegs with this speaker but have never come across any documentation that the company offered them.
david