Being married to someone who is allergic to Aspartame we have been searching for Splenda pop, here is what we've found:

Diet Coke has a Splenda version - but it can be hard to find.
Pepsi One is another Splenda pop.
Diet 7Up was Splenda for a few months, but they have switched back, except for their Diet 7Up Plus line.
Diet Rite of course.

Keep on buying Splenda pop so that the industry will make more!