Peter,
I went to college in Riverside, and spent a lot of time at Moreno Valley Ranch. Can't believe it's only $28 to play there. I think it was more when I was in school 20 years ago. Great practice facility. Our club team really only played in the Spring season, so I'd spend a fair amount of time at that range during the fall. I always thought the mountain nine was the most fun, but the valley nine was probably the better test.
I always thought Oak Valley was a lot of fun to play, and really enjoyed it. I last played there about six years ago, and they switched the nines, and finally got the development to fill in around it. I remember going there when the clubhouse was a double-wide, and it was in that state for quite a long time. Only played across the road once, as it opened after I had already moved to Chicago. Goose Creek is indeed a flatter piece of land than Oak Quarry (I've played each once), and I remember it being a pretty good experience for the price, but I haven't been there in probably more than 10 or 12 years.
From the pictures, it looks like they've got Oak Quarry in pretty darn good condition.