Honey, Pearl and I have spent some time last night working on this.There are some amzing (tomy mind) things out there. She got a Round Trip to EWR for £510 up graded to CW with 25,000 miles. A snip.
MSP is a beast to get reasonably priced. The problem is that the only airline non-stop to fly there is NW. Enough said. Eveything that touches the place is pricey. Your best bet may be to base the fare on ORD and just do the hop up to MSP on the cheapest ticket that you can get (AA would probably be the better bet for miles and points). The cut off date for these fares seems to be 14th Dec.