S.S.
Typically, many preschool programs start 2 years before the start of kindergarten, with a gradual increase in "academic" type activities as they approach K. What preschool is great for is the introduction to a school setting, and all that it entails (waiting in line to wash hands, sharing toys, sitting for snack time, learning to respect other adults, time away from parents, etc.) Learning to navigate the social scene is many times more important that the academic stuff.
I live in the north metro, so I can't give you a recommendation. But, there are a few different types--school readiness programs offered through your school district, preschools affiliated with a church (which may or may not integrate a faith-based curriculum), Montessori, general private, and day care centers that also offer a PS curriculum. (I'm sure I'm missing some--this is a general summary.) I'd start with researching the philosophies of each, determining what you're looing to get out of school, and then narrow your search from there.
Good luck!!