For years I have played thru a rack with 2 GK 400 RB's in a stereo set up, an aphex 204, an alesis 3630 compressor and a yamaha emp100 effects processor, thru several cabs, a sunn 18 & 12 cab, an ampeg v6b cab with two 15 ev's, a swr gollith jr 2x10 with a horn.
Recently I decided I wanted more headroom and a crisper sound. Also decided to go back to a mono set up. I went to Bass Gallery in Atlanta and found a GenzBenz GBE 750 head and a Uber 4 x 10 cab with horn. Man this is a nice sounding rig. I still use the Aphex 204, and for now the Yamaha processor. The 4 x 10 is a 4ohm cab, so is the 2 x 10, and I wired the 2 x 15 to be 4ohm also. Any combination of these three cabs is wicked. I'm about to add a dbx 160a or 166x compressor to my rack. The alesis robbed too much tone so it didn't make the cut to the new rack. The GBE750 has two channels, one ch is solid state, one is tube. I came up with a mix of the two channels that I really like so that's pretty much set in stone. Anyway that's pretty much where I'm at rig wise.
By the way if your in the Atlanta you should check out The Atlanta Bass Gallery, Jim Rubio has a very nice store with lots of fine equipment. The last time I was in there he had three Alembics for sale. Lots of nice instruments and pretty much nothing but bass equipment. BASS HEVEN SWEET.