I think the e89 Z4 is one of the best looking cars BMW makes, particularly the sdrive35is. It's also faster in a straight-line than the e93 M3. Production run of the sdrive35is is limited so it's still something of a rare bird and you don't have to worry about a e89 M that would upstage it as it's the Z4's M-equivalent since BMW is not M-ing the z4 any time soon.
The sample below is here in San Diego which is driving distance for you, practically new and has almost every available option including M package and 19s. If you don't buy it, I might
. It's a little higher than the other options you were exploring but I think they could be talked down into the 50s as I know it's been sitting on their lot awhile.
http://www.autotrader.com/fyc/vdp.js...standard=false