High Current Split Supply
While I am yet to find a satisfactory answer to my question--I'm still digging--I found the attached circuit on Reddit, and plan on trying it out. 

http://www.reddit.com/r/AskElectronics/comments/16owyj/heres_a_rail_splitter_circuit_30v_in_15v_out_aka/



I'm cautious about using a buck converter, because (1) I haven't worked with them before, and (2) having a plus/minus buck converter set up is a very complex place to start.