I think your instincts are correct to keep Talor Battle and Gary Flowers, which leaves a choice of Augustus Gilchrist and Ty Abbott. Abbott had a run of nice shooting in Pac 10 play last year, but I think his upside is limited. Gilchrist, on the other hand, will likely be the centerpiece of the Bulls offense (especially with Dominique Jones out of the picture). If your league has a center requirement, I think Gilchrist is a shoo-in.