I have used Neurocore, MP Assault, 1MR, A1 Maniac, and just recently Dark Rage. Neurocore (old formula) was the best for me. I haven't tried the new re-formulated stuff but I am sure it works just the same. I bought like 6 tubs total throughout especially when they were like $15 when they were trying to get rid of the old formula ones.... best one I have used... as of yet. You can really feel the tingle and energy.
Dark Rage is the one I am using now and oh man, It made me want to punch a hole in the wall... It didn't hit me as hard at first and I didn't feel insane tingles like I did with Neurocore but I sure felt it 40 minutes later... I was killing it. It had me pumping like no other. I am actually quite happy with it dude.
As my post workout I would drink 2 scoops of protein and 2 scoops of gatorade powder. Actually was pretty good and well any and all results I have had were of course due to my hard work at the gym but as far as the supplements it all comes down to treating your body right and giving it what it needs before and after a work out.... especially after a work out.
You said you're using C4... how are you liking that and how does it make you feel? That is one I have meant to try but never got around to it.