I bought a blue Nomade in 1977. Beautiful bike though it was the entry level model. I paid somewhere between $180-220 for it back then, a major expense for a young teenager spending his own money. Your parts description sounds like mine when it was OEM. I changed out deraileurs and shifters for SunTour and some inexpensive Japanese alloy wheels and it took me thru college until I got into a club and built an early Cannondale. Post pics if you can, as it will be a huge nostalgia rush for me.

$ value probably won't be high. Mirages, the next step up usually sell for $50-75 on eBay. I picked up a really clean 1978 Gran Jubile (a few more steps up the line with a cromoly frame for ~$80 a few months back.