lk99bt, welcome to the forum.
You might want to read the sticky thread atthe top of this forum for an explanation of the ordering/delivery protocols recently implemented.
The blades shown on the Busse site are the only models available for order at this time.
The Battle Mistress is normally the largest Busse blade produced. It has not come up in the production rotation line-up yet. Rumor has it later this summer/fall.
Double-edged Busses are few and far between, usually as a one-off variant.
There were some early Busses that were double edged, and these now sell at a substantial premium on the secondary market.
I hope this helps. If you need more info, just ask. The hogs around here will be glad to help out.
Mike