I no longer use them but I have used just about every one on the planet.
My favourite; Jack3d (The original) or Labrada Super Charge
If you find the above actually not strong enough, maybe worth trying ''BPI One more rep'' - You really do only need one scoop, personally I didn't get along with it as I found it too strong. Even at 1/2 a scoop i was sweating my tits off & feeling like I was on smack.
LG sciences anabolic GT - Another good choice if you can find this.
Controlled Labs White flood = Another jack3d alternative, very similar and I find it can usually be found in sales, if you can save a quick buck go for this over jack3d.
Pre workouts I felt were sh1t - BSN No Xplode, Gaspari Superdump, Concrete, MRI Black powder, VPX NO shotgun, Universal shock therapy, Muscletech Nano vapor, PHD Wired, IForce Maximise (first & second ediiton), Cytogenix Cytonox (sister company of Muscletech), Hemorage etc etc