Mileage Run Discussion - Need DL/NW MR for 12k EQMs - ideas for ORD?

I need to grab 12k EQMs and am new to searching MRs. Looking to fly Delta/NW out of either ORD, MDW, DTW, or GRR around Nov 20 and willing to spend a couple nights somewhere. Need to keep the price below $800. Have looked at going to Tokyo or Singapore but would prefer something in Europe if I could find it. Any ideas? Thanks!