Matching at any CA rads program is going to be very difficult, so you should feel privileged if you do.
So, given that, here are the programs IMO by reputation:
UCSF > Stanford > UCSD > UCLA > UCD > UCI > Loma Linda > SCVMC > Harbor-UCLA > Cedars > SBC > Kaiser LA
Once again, they are all great programs that are all difficult to match at!
Generally, to match at one of these programs, the absolute minimum:
USMLE S1 > 220
Regional ties to CA (or else an away rotation)
Good LOR
Good clinical evaluations
If you are gunning for the upper tier programs:
USMLE S1 > 240
Regional ties + away rotation
Research with pubs
Phenomenal LORs
HH/Honors in most clinical rotations
These are gross generalizations. For more mind blowing discussion, go to
www.auntminnie.com