Butter or butter substitute

I've been doing very well without the need for butter, but.......there are some things which I can forsee that I might enjoy the taste.  What kinds of non-fat or lowest fat/low sugar butter or butter substitutes would you recommend?

I use the real stuff, but very, very minimal.  If I'm cooking and something calls for butter, I use 1/2 butter and 1/2 EVO.  And if the flavor is compatible, I substitue butter for EVO when I cook for my DH.  EVO won't work for desserts or non-savory dishes though. 

If I don't do real butter I will do the Smart Balance 50/50.  I try to stay away from trans fats.  Real butter in small amounts won't hurt you.

If I'm wanting something on veggies and other seasonings won't do, sometimes I will use Molly McButter.  I used to love it on potatoes as well.  It's only 5cal for 1tsp, no fat and 1g carbs.

thank you for your tips folks.  In the past I would use one of those non-stick cooking sprays.  Any thoughts on those.  There are so many different ones out there......