I agree - I like the NFSC recipe, too! I add extra vanilla or sometimes another natural flavoring (almond, pumpkin spice, cherry, caramel, etc.). I've added lemon zest with great results too.
It is not an overly sweet cookie (like an actual sugar cookie) - but I like it even without icing. It is especially nice for decorated cookies because there is so much sweetness from the icing on top, the cookie balances that nicely.
Other recipes that I've tried and liked are the roll-out cookie recipe from Martha Stewart, Penny's cookie recipe. I've heard great things about the "modified NFSC recipe" (there's a great thread on here about it).