Seeing how you are mixing it in with a protein shake you should check into Avant Researches
SyntheSIZE, as it has a blend which contains creatine mono and also aids in protein absorbtion. Personally I have a hard time responding to creatine, and SyntheSIZE is just one of the creatines I've responded quite well too. I'd say my top three, being the only ones I've truly seen results from, would be
SizeOn, Clout, and SyntheSIZE. Hope that helps if you decide on looking for something containing a little more than simply mono.