Don't be afraid to use a condenser mic on a bass cabinet. Ultimately, the full frequency response lends itself nicely to bass. Just make sure to back it off a few inches- like 12 or so!
Now if we were to get picky (and pricey), a tube mic can do wonders for bass. There are some decent ones out there that don't break the wallet completely (relative, I guess), but the good thing is, after purchasing one, you'll have it for use on everything, and trust me, if you're using a digital recorder/DAW/PC-based system, you WILL want to use it on a lot.
By far my tried and true favorite method to record bass is with one channel direct from my preamp (Aguilar DB680- gotta love it!), and one from a few inches out in front of the cabinet. Each speaker can sound very different, so spend some time with your ear in front of each speaker. Sounds silly (and dangerous), but you can learn a lot about how your cab reproduces frequency by truly listening to it up close and not from far back (within the context of a room). A Very good point made above about the phase cancellation, by the way.
An AKG c3000 (large diapphragm condenser) is my fav mic for general purpose recording where a high frequency response/large dynamic range is desired.
Hope some of this helped.