My favorite that I have tried
Ergo lean Amp + ephedra + ALRI ENERGEX + tyrosine
I've tried damn near everything at this point, it's a bit to much caffeine but still great mental focus plus some appetite suppression from the amp. I don't get jittery on this either and crash later in the day. A good nights sleep helps also.
I tried Custom's Power Jolt + Enlighten stack (not as good but ok)