what about kombucha or water kefir? I personally wouldn't want to drink 2 sweetened drinks a day but I do make iced tea or lemonade for a special treat once in a while in the summer. I usually use honey (dissolved first) and often use pureed peaches or berries in iced tea as well. You might also try out coconut sugar (similar flavor to turbinado but more nutrients). But sugar is sugar is sugar, best in strict moderation. And the more you have the more you want!
You could also try using stevia with another sweetner to cut the sweetner down more and mask the bitter taste stevia has, I wouldn't touch splenda as I'm extremely suspicious of the artificial stuff. Anyway, keep playing around, you'll figure out a good compromise eventually!