You're aware of the LASF2 double EQM promotion, right? By my calculation a single round trip ORD-DFW-LAX-DFW-ORD or even IND-DFW-LAX-DFW-IND would get you the EQM that you need. (Register before travel!).

Your best bet will be to pounce on a good e-fare Tuesday am if there is one. I looked but did not see anything quite within your budget and dates... keep an eagle eye on it in the next day or two and shoot for that DFW promotion.