Greta looking frame! I love the colour. Don't be put off at all by the fact that it's not top-of-the-line. Almost all French bikes are nice riders and that's what you bought it for. The main difference will be a bit of weight in the frameset, and take it from someone who's ridden very heavy to crazy light, it won't make any difference in how much you enjoy riding it. The fantastic news is you already have a BB and headset in there, so the threading doesn't really matter, just re-pack them when you take possession of the bike.

If this bike were mine, I'd keep everything on there and build it up on the cheap. Don't pitch the seatpost because it can be a pain finding the right size again, just purchase a $3 clamp for the top. Put your money into a nice leather saddle, as that will have the biggest impact on the overall look of the bike, and crank next. I don't know if singlespeed is your thing, but with the lack of braze-on's this frame would make a killer singlespeed, and then you could also throw on a cool french chainguard and maybe some fenders. I think that's the route I would go.