I am often in a Mormon query. How much do I give? How much is too little, how much is too much? This mostly relates to fast offering, but I've felt it more as we have been giving for the humanitarian aid stuff. I know that God doesn't want us to give away so much that we're unable to provide for our own family. However, define "provide" -- I'm fairly sure it doesn't mean cable internet and date nights (although it may include date nights). We're not rich, we're not poor, we do OK... and we definately give more than we would usually spend on 2 meals.
I think that you have to go with your "gut" (or the Spirit, as we LDS might say). but, sometimes I worry my gut's greedy. :)