Yo Mikeeley! What kind of 8 tracker are you using? Most standalones have a high-Z (guitar) input, which is essentially a DI box. The sound quality isn't necessarily that hot, like the preamps in most standalones, but it beats the hell out of nothing. These days, I would be more likely to get a preamp with high-Z inputs than a pure DI box, because you can use the preamp for more things, like that D112 on the cab into channel A, and a direct Bass line into channel B, for instance. For DI, I have used Joemeek twinQcs, a dual channel strip (a mic preamp with EQ and compression), M-Audio DMP3, (a cheap, versatile preamp, maybe just what you need), Avalon AD2022 (wicked expensive preamp to die for), and POD Pro (an amp modeler that's also a DI box). I'm not a fan of the POD for bass, although there is a bass POD, which would, no doubt, be a big improvement.
For pure DI boxes, many people like the Sansamp, Countryman. I still think the best DI bang-for-buck is the
Avalon U5 for about $500. That sounds expensive, but for an Avalon, it's cheap as hell.-Richie