Are you looking for something that is sweetened but not pegging the glycemic index, using fructose and/or complex carbs to slow the insulin spike or are looking for a more protein drink?
There are reviews for sport drinks for cycling[i.e. endurox cytomax,and accelerade] and drinks for bodyduilding [pre and post workout recovery drinks.]
Some have stimulants lke guarana,taurine,caffiene or products like branch chain amino acids or creatin.
Both bicycing, outside, and muscle and fitness have done reviews ... go hit your library.
PerformanceBike currantly lists 32 brands. I do know taste and consistancy play a big role in how well you can chew down some of these drinks.