I really like the Sugar-Free DaVinci's syrup in Vanilla. I found it in my local grocery store for $4.99 for a 20 oz. bottle (approx. size)
I make a SF vanilla iced coffee using 2 level tsp of instant coffee, 1/4 cup 1% milk, 2 splenda packets, 1 T of the syrup and about 15 oz of water. I put it in a big mug, mix it with a spoon and add lots of ice. It hits the spot and is a great substitue for the SF vanilla iced coffee that McDonald's sells. I got royally hooked on the stuff. Problem was it got expensive, the staff making the coffee seemed to be following different recipes, it never tasted that same twice in a row and I can save a lot of calories making it myself.
What I don't change today, will be the same tomorrow.