A 78 Nomade was my first "real" bike and I have fond memories. However it's not a high end model so don't go crazy.
Here's how I upgraded mine back then: SunTour Barcons to eliminate the stem shifters
An inexpensive "replacement" set of alloy rimmed wheels (27"). Such things are not as common today
An early ST Superbe rear der.
ST 6 speed freewheel
A variety of different saddles and a set of alloy bars.
Made a decent bike I enjoyed for nearly 10 years.
Btw, I don't recall Nomades in 2 tone paint mine was blue and others I've seen were mono-colored as well.
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“Life is not one damned thing after another. Life is one damned thing over and over.”
Edna St. Vincent Millay