Dahua 12MP IPC-EBW81200 - $874.99
http://www.dahuasecurity.com/products/ipc-ebw81200-901.html
Vivotek 12MP* FE8191-V - $1,050.00
http://www.vivotek.com/fe8391-v/#overview
*9MP effective camera
Panasonic 9MP WV-SFV481 - $1414.00
http://business.panasonic.com/security-ultra360-series.html
I demo'd the Vivotek recently and there's a definite improvement in picture clarity over the 5MP. However, the 187° AFOV of the SNF-8010 is just a must-have feature for FishEye IMO. Unless you mount a 180° AFOV cameras really high, you're probably not going to see what you want. If I were to guess, the 7° difference equates to about 15ft higher 25 yards out. That's the difference between only seeing someone's feet at the door verses all the way above the door.
I've deployed a number of SNF-8010s and really like them (they're far from perfect though). Can't wait for higher res versions to come out.