When it comes to Chanel eye shadows, the quads and sets are the one getting all the attention, while the single eye shadows are unjustly left behind. The Ombre Essentielle range is worth trying, and from my experience the color payoff is often better than in some of the quads. The texture is silky soft without crumbling and easy to blend. I love the finish I get from them- both the subtle wash when applied dry and the rich intensity you see when used with a damp brush (see the swatches). It's also buildable enough for contouring.
A few seasons ago I fell in love with Le Bronze (#73) but had my eye on the other color released with it, Bois Bleu (#74) which I only bought recently during my quest for the perfect non-navy blue. I think I found it here. Bois Bleu is not quite teal but has a bit of green in it to make the color stand out.
Safari (#45) is a Chanel classic. It's one of those colors that are extremely hard to capture on camera. A complex satin taupe that goes everywhere and with almost anything. If I had to pick just one Chanel eye shadow from this range, I think Safari would be the one because of its versatility.