Some good pre workout supps I'v tried are NO Explode and Fast Twitch.They'll definately help you through those hard workouts.If your not talking stimulants than perhaps CEE is what your wanting and is very effiecient as well.
The only other thing I think you could be asking is what's the best legal supp for building muscle?Several are availble right now but aren't advised for younger users or inexperienced lifters.None the less the answer would be SuperDrol,Phera Plex,or Halodrol and their respective clones.Also note these are PH'S/AAS and are not to be taken lightly just because their legal.
I had the best success with a stack of finigenix and promagnon 25. Worked unreal for me.
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My philosophy, if you can't get it from a big name provider website, you shouldn't risk it. If there's nothing illegal about it or nothing to even worry about it you shouldn't have to look past places like IML or bodybuilding.com.
Try Ephedrine HCL and caffiene, I just recently started using that and it's giving me an awesome charge. VasoPro Ephedrine is available at Bodybuilding.com and that's what I'm using.
"Years of hard work for only a single moment of perfection is a worthy trade." - Myself