I'm not a fan of stevia, so I don't use it and don't have any advice.
There is a stickied thread in the SB Frequently Asked Questions forum you can check out that has a ton of info on sweeteners and the like. It's called South Beach Diet and Replacements for Sugar (Sweeteners, Substitutes, etc.)
It talks about all kinds of sweeteners and what's best for baking, coffee, etc. I hope it helps!