It depends somewhat on the tone you're going for. The Beta52 works well but can miss some of the high end definition if your sound has that. I had good success last weekend with an Audio-Technica ATM25 which seemed to capture the total sound better.
Yeah, I noticed the D6 that I have doesn't capture enough of that "twang" sound just the deep lows. It's good for some music, but like poppy style punk rock (nofx, set your goals, face to face, blink 182) you want it to be real bright sounding. And I would rather say away from having to boost the hell out of EQ.
Second the ATM25. It has flatter response than the 52 or D6, a better place to start for bass, IMO. Not as much low-end hype, so a more focused sound, to my ears.
AlexW's advice is pretty good, and if bleed isn't an issue the bass response on the D6 drops with distance (proximity effect).
Also, ebay might be a good place to look. The ATM is a pretty versatile mic, if you ask me. I have used it on kick, floor tom, bass, horns, vocals, and probably a few other things, as well.
The reason I was sad because Sam Ash doesn't sell it is because today I am gettin a Sam Ash credit card. I wanted to use that extra denero to obtain some tid bits for my studio. It needs some sprucing up.
I have been using an RE-20, or the Neumann BCM701 these days. I also really love the TLM170 as well. I have had good results with so many combinations, that these mics I reference are really just a starting point, and they stay up a good percentage of the time. For rock growl: BCM701, for dub lows: RE20 or FET47...
For low money: 57 with a 4033 works really well. i like the 4033 on low end stuff a bunch.
I have had good luck with the Shure SM7 paired up with a direct line. The bass tone is very important too. Often mics will pick up a lot less "bass" than what you're hearing in the room unless you spend a lot of time tweeking the amp and placement.
actually, the oppisite of this is one of the things i like about the re-27
i can get right up in the grill and not end up with a bunch of extra bass.
(small space, i close mic everything to avoid as much bleed as possible)