Actually on second thought, living in Clayton would be okay if you lived in the area called "The Moorelands" and had a 2 bedroom apt. Those are actually pretty affordable and in a great area. Try there if you want Clayton, but I still think Midland and Delmar is better bang for your buck.
PS if you are moving to St. Louis, let me know. I will be moving from my current place at the end of July. It's nice, 1800 sq feet w/ a basement of the same size, 2 bedroom, study, sunroom, dishwasher and washer and dryer in unit. 5 Min drive 15 min walk from WashU, plus my landlord is great. All that for only $1,000 a month.