Skip MRI, it's way overpriced, you can the the same or better stuff for much cheaper.
Nothing reduces fatigue like citrulline, so the NP stack is great, plus it has CEE and the arginine. Pumps are phenominal, and longer lasting than with any other supp I've used.
For stims, there are LOTS of things you could try, it just depends on your tolerance and how jacked you like to get.
Optimum Nutrition Lean Tea has green tea and 140mg caffeine per cap, for $7. Cheap, healthy and effective.
I personally love MRM Driven, you could just throw it in the NP stack and drink it.
I also love MHP Anadrox, it worked REALLY good, with a nice clean buzz.
AMP/StimX are about as stimulating as it gets, I think. Pretty wild stuff. 1 AMP makes me feel good yet relaxed. Two makes me feel stimulated. Three makes me feel like I'm 'on something' illegal, with a huge crash.
IBE's Matrix is not out yet, but when it is, it would be my first choice, it's the smoothest, cleanest energy around. xFactor is supposed to feel the same, but stronger. I'd highly recommend trying it.