We go to Dr. Louis Haken at Northside Pediatrics - I know it's not on the south side but it's a pretty quick shot up Kansas Expwy - we are in the SW area of Springfield. Dr. Haken is a great doctor and the NP, Eileen Llewellyn, is fabulous. She is very available and she is just very sweet and so wonderful with our children (we have three boys). She also takes LOTS of time with us which is always appreciated.
As far as an OB, my only experience in Springfield is with Dr. Shultz at Primrose OB/GYN (right next to Cox South) and it was not a particularly good one. He's very rough, didn't spend a lot of time me during any appointment (I always felt rushed), and gave me false information about a type of birth control after the birth of our son. I later found out it was probably because he wouldn't have gotten reimbursed very much from my insurance and it wouldn't have been worth his time to do it. There are lots of other doctors in the practice but just so you know, they are ALL men. I also experienced VERY long waits in the waiting room for all of my appointments, frequently over an hour. I have a friend who sees Dr. McCorkle and loves him (he's at Primrose as well).
Hope this helps!