Splenda is good. It tastes fair. Also there's Zsweet. I would not advise anyone to use Aspartame. It may be suspect of safety and tases Foul. the old traditional Saccharine is Ok. You can also try Xylitol It's sold at Waitrose. I can't remember the Brand name. Most of the other ~ols cause diarrhoea in any quantity.
Hana