Honestly, I went off of my gut instinct. If I felt like the RE was overly "selling" me on the whole process, then I was turned off. I checked out the SART scores, too, but really, I went with my feelings. I see you live in CA. Personally, I used one of Kaiser's Nor Cal Reproductive Clinics--I LOVED the RE...he was friendly, but very no-nonsense and honest, which I appreciated. He didn't sugar coat the situation and was very up front. I also did some research on him and his success rates, too, before deciding. Good luck!
http://www.sart.org/find_frm.html
You may use this link, click state you live, and check the different clinics vs. their success rates and etc.
good luck.