Sugarless?
If you want to leave out the sugar (which I would also do), you could use honey instead or Agave Nectar or a non-aspartame artificial sweetener.
A note of caution re: Agave Nectar. It has a low glycemic load (see table in the link); however, recently I posted on CZ a study on another food with a low glycemic load but studies showed that the item raised the risk factors for cardiac problems and diabetes. Further study is warranted in this area. So, as with all things, use Agave Nectar with caution.