Right now they have:
DC = Diet Coke
DC-S= Diet Coke-w/Splenda
CZ= Coke Zero
DC-L = Diet Coke with Lime
I actually really love regular DC
I thought for a while that Splenda-DC would be great but I think it actually misses some of the tartness of the artificial flavoring.
That Coke Zero tastes way too sweet.
I really do like the regular DC, and DC/Lime. The DC-lemon tasted like toilet cleanser.