There was a daily DL nonstop MSP-CDG for a part of last summer which may or may not return this year. Unfortunately, it was a hrooible old 767 plane, so maybe this was why the route didn't succeed. AMS connections are easy and efficient, and allow you to go through customs at MSP on the return, so no worries about long lines or delays causing missed connections. DTW is also a quick and easy connection point, even in winter. The best DL aircraft for international coach is the Airbus 330, which is currently used for AMS-MSP (2-3 times daily, depending on the season); new planes and great IFE/AVOD with individual TV screens in coach. If you travel enough to get Plat on DL or any other SkyTeam Elite Plus, you'll get lounge access (MSP,DTW,CDG,AMS) on any international SkyTeam ticket.

To me, it looks like there isn't much choice other than DL, but you might want to consider United as they have a number of MSP-ORD flights throughout the day. This would get you into the *alliance for airport lounge access and you could consider flying United but crediting your miles on Continental.