Camera specific Filename options?

i use a Pro DSLR and some P&S cameras, and would like to keep their images separate. since the camera info is in the EXIF, all catalog apps can of course easily select by camera.

i would want to go 1 step further, and also identify the camera at the OS level via naming. reasons for this:

- my Panasonic LX3 has problem files. the RAWs are not readable by EM2, and the DNGs not readable by OS X!

- my P&S cameras produce video files that LR can't read (can't upgrade to LR3 until i buy an Intel Mac)

SO, based on these file specific issues & app specific handling, it would make sense to also separate at the OS level.

OPTION A: (what i currently do):

CAMERA > YYYY> MM > filename as produced by camera (example: ORIGINALS > LX3 > 2010 > 07 > P1050470.RW2)

OPTION B1: (what i'm contemplating):

YYYY > MM > camera-yymmdd-camerafilenumber (example: ORIGINALS > 2010 > 07 > LX3-2010-07-14-0470.RW2)

OPTION B2: (slight variation):

YYYY > MM > yymmdd-camera-camerafilenumber (example: ORIGINALS > 2010 > 07 > 2010-07-14-LX3-0470.RW2)

Advantage Option A: all files for specific camera in a single root folder, BUT backup a bit complicated due to 'latest files' to be backed up will be in each of the separate camera root folders.

Advantage Option B:
- having the camera name in the filename allows me to co-mingle files from different cameras in the SAME folder shot on the SAME day without fear of duplicate names
- ease of backups, since there is only ONE time-based high level structure (1 folder per month, as opposed to 1 per camera per month as in option A)

Leaning towards B1.

Any advice? Pros or Cons w/ the above? Any reason i should perhaps pick B2 over B1?

Maybe a different Option (not listed) altogether?

thanks,
- pieter