Gary,
For many years I was thoroughly content running my '81 S1 into a ten-band graphic and straight into a pair of CS-800 amps connected to small pile of 18s and 10s, x-overed at somewhere between 250 and 500 Hz. The bass has enough output to drive an amp at line-level, and enough tone control to make it a not-insane proposition.
Currently I have 3 different setups, the newest being an Ampeg B-5R head pushing a Kustom 410H cabinet - and I love how it sounds. I also have an ART tube preamp w/parametric and compression which sounds very nice, especially when run through my ancient Bogen 200w all-tube power amps into any cabinet you connect to them. I am probably going to part with setup number three, which consists of a Bass Pod Pro and Peavey DECA 1200 power amp.
For cabinets, I have a couple of 18 folded horns (similar to the Acoustic 301) which are great for either getting that Jaco sound or for loud rock in a big room. I've got a Peavey 210H that's great for small jazz or blues gigs and reproduces the full range of Alembic tones. I now have a 410H Kustom cabinet, which is pretty much a full-range system as well. Oh, and an old Lab Series 115 which sounds like a box but works well for blues.
I find that I tend not to like biamping, because of the complexity and the need to always carry a minimum of 2 cabinets to every gig. Power is cheap these days, and the newer 410 cabinets handle tons of it quite gracefully. For me, also I must take into account that no matter how high-fidelity my system may be, unless I'm listening in the living room it's mostly wasted effort. An amp that sounds musical at a high enough volume to compete with the guitars/keyboards/drumses is often all that I can realistically hope for after feeding the tribe and paying the mortgage. And perhaps most important, I'm getting old and becoming much less of a gearhead than I once was. While I do certainly envy the folks with the systems to die for (and there are many in this group!), the Alembic sounds good no matter what it gets plugged into, IMHO...
John