I don't think it's worth the money if you choose small size. For the small size Enduro, you'll get a smaller crank shaft, and the frame is like 10 cm shorter than medium, I don't know your height, but I am like 5'6" and I have medium Enduro. I love my Enduro, it's the 04 Enduro Expert, just got it for 2 months. Hey I am in San Francisco too, didn't you check out the Speicailized dealer store at Sunset?