I recommend Chris Grcevich, operating out of KCCR's Sterling Aviation - he has access to several different aircraft ranging from a piper cherokee (archer II), C150, C172, C180, Cirrus SR-22, and probably a few others by now.
I flew with him in highschool and he's got tons of hours, lots of experience and the patience and understanding we all would hope for when trying to get through certification.
His flight dynamics are also very progressive. I spent most of my time over Sonoma County (SW of travis AFB) in "the practice area" with no other planes, lots of fun stuff, plenty of room to do your steep turns, engine failure, stalls, wing-overs, lazy 8's and yank&bank along the river with no worries in the world what so ever.
give him a buzz!