Any Recommendations for a Limo / Car Service @ SFO

I was thinking about using some miles to get a CDC from SFO to Santa Rosa at the start of our roadtrip in the Pacific North West this summer. I then sat down and worked out what it would take to recoup 17.5K miles give my earning pattern and thought 'well, that looks expenseive'. So, can anyone recommend a decent limo / car service from SFO? I've done the usual on-line searching, but would like, as always, temper that with any first hand experience that anyone can offer.

Thanks

Paul

Virign Limo aka Avalon is what many us V-Flyers (inc myself) have loyaly used & recommended for a few years now http://www.virginlimo.com/