DL award pricing generally coorelates with revenue fare pricing. If you go in off/shoulder season when roundtrip fares start in the $500 - $600 range on ORD-NCE/CDG, you can find DL awards from 36K miles roundtrip in Basic and 52K roundtrip in Main. During the summer high season when fares are generally $1K+ (which appears to be the timeframe you are looking at), awards at 92K - 100K in Main will likely be the cheapest you will find.