I absolutely avoid all chemical artificial sweeteners and, as of late, all 'natural' sugars too. If you include chemical sweeteners in your diet, you may be interested in understanding why they are poison to the body. Just in case you think Splenda is o.k. because it's "made from sugar" (um, yah, sugar and chlorine), you may like to check this out.
"Sweet Misery" is a documentary about the facts of aspartame. Definitely worth watching if you or anyone you know uses artificial sweeteners.