If you can get it Hansen's "Natural" Soda (DIET) uses Splenda. I love this stuff but not sure if you can get it outside of North CA. I especially love the tangerine, strawberry/kiwi and the Root Beer is amazing! The Ginger Ale is nasty though, I'd steer clear.
Arizona Diet Green Tea is excellent as well.
I wish they'd make Dr. Pepper with Splenda.