My 2c ...
I had the opportunity to try a bunch of kick drum mics before I bought one. Here is a brief overview of my impressions:

D112 - OK mic. Fat but kindof peaky in the 2K range but dull above 5K.
Beta52 - Again, an OK mic. Somewhat hyped low end but an unpleasant "thwacky" sound that was hard to EQ out. (This is a nitpicky thing, but one thing I didn't like was that if you remove the grill, the capsule is not much larger than an SM57. I felt like I was being duped by this huge mic body.)
Audix D4 - Not bad, but a little thin. More extended upper range. Overall pretty natural sounding (can be bad or good depending on the sound you want)
ATM25 - Good sounding mic. It falls somewhere between the D112 and
E604 in naturalness vs. processed sound. Overall, I liked it.

EV 868 - Killer sound. Pre-processed sound from the mic needs little EQ'ing. Sounds almost like it's going through a compressor (in a good way)
Sennheiser E602 - Wow! Killer, CD ready sound! Very pre-processed sound. It makes most any kick sound good.
All comments are MHO, so don't get your panties in too big of a wad if you don't agree. When I say "pre-processed", I mean mid-reduction with low end enhancement.
I play and record mostly rock stuff, so my taste in a kick drum sound is a contemporary, rock thump with scooped out mids (-5 db between 250 Hz to 2000 KHz). My kick is a 16"X22" (depth X diameter) Tama with Evans EQ3 heads front and back - no hole in the front head with a towel folded in the bottom touching both heads.
I went with the EV 868 and am very happy. I have recorded several different drum sets and it sounds great every time! That's a real plus if the kick drum you are recording is less than a "drum doctor" prepared monster!
Depending on the type of music you plan on recording, different mics might work better that others. Also, I don't think the EV or Sennheiser would work as well on other instruments (like bass guitars) because of the significant mid reduction.