You could try Sulbutiamine + Guarana. Guarana does have caffeine in it but at the normal guarana amount used, it is about 75 or so, not too crazy. Also has other stimulatory properties.
Do you get your caffeine from coffee or just straight pills/powder?
Coffee has other stimulants in it other than caffeine, namely theophylline and theobromine. Theophylline is a non-selective PDE inhibitor resulting in a much longer-lived production of cAMP, and is an adenosine receptor antagonist. Theobromine can do the same but is also a vasodilator.
Coffee also has mild MAO-I effects from beta-carbolines norharman and harman. MAO is a target of many antidepressant and neuro-protective drugs. This is why coffee can have a bigger impact on one's mood than just caffeine alone, because the inhibition of MAO prevents the breakdown of neurotransmitters and thus increases their availability (serotonin, dopamine, nor/epinephrine).