I'd love to try the Aguilar DB412 in Chocolate Thunder. Mmm. Otherwise, Bergantino has a good reputation for their cab quality and sound. The GK 412 looks nice, too. I have never played through a 412 but I'm sure they're awesome.
The Gallien-Krueger Neo 412 bass cab a high-powered bass cab built to deliver silky-smooth, solid tone with less weight. This compact roadworthy, front-ported cab is loaded with four custom-designed, cast-frame 12" neodymium speakers. Neodymium speakers are lighter than traditional speakers, but deliver the same robust performance. Tuned for a consistent response from top to bottom, there is plenty of definition in the highs and mids, coupled with a fat low-end. The cabinet also features GK's bi-amp system; Speakon-style and 1/4" connectors; 1,200W power handling; rugged 11-ply poplar construction; Tolex covering; reinforced, interlocking corners; 16-gauge steel grill; a pair of 3" dolly wheels; and an easy-grip handlebar. Gallien-Krueger Neo 412 4x12 Bass Speaker Cabinet Features: 1200W power handling GK-Paragon tweeter 4 ohms impedance 36Hz-19kHz frequency response 107dB sensitivity Crossover circuit with bi-amp/full range switch, horn power limiter, and high frequency attenuator 1 Speakon, 1 - 1/4" 11-ply poplar construction Black tolex covering 16-gauge steel grill Tilt-back handle and wheels Custom-tooled interlocking corners Front-loaded ports 54 lbs. 25-3/4"W x 40"H x 16"D
There's the Bergantino NV412, Mesa Powerhouse 412, Schroeder does one, and of course there's alot of other 2x12's that could be paired. I bet a pair of GB Uber 212's would kill.
Mesa Powerhouse 4x12 http://www.mesaboogie.com/Product_Info/Bass_Cabs/PowerhouseCABS/PHbass4x12-LG.htm
The Schroeder 412L is a killer. And it's not a fridge - it's only marginally bigger that a typical 4x10.