I tend to turn to the Sally Hansen Complete Salon Manicure range if I can't decide on what polish to wear. I love the brush and the formulas tend to be perfect. I hadn't worn greige as a full manicure in quite a while so I opted to pop that on. I use this a fair bit in nail art but it is actually pretty nice on its own too.
I have 3 coats of Greige, no basecoat or topcoat. These polishes don't need a basecoat unless you are wearing one of the teal polishes (blue streak and Jungle gem for instance). They will stain your nails so I always use a basecoat before wearing one of them. You definitely do not need a topcoat. these are perfectly glossy on their own.
I mentioned before that this is not a greige really, it's just a light grey. There is not hint of beige in this whatsoever. It wears really well and I managed to get a full week out of this manicure with only a minor amount of tipwear.