My favorite is the red or blue Amp but I also LOVE those "Black Ice" ones where you pop off the cap and it makes a loud noise and mist comes flying it...cool as fuck
. Those "Rehab" energy drinks that aren't carbonated and have really low calories (like 10 or 20 calories per can) are also pretty good.
I also love BAWLS! I don't drink it that much but occasionally I will order a bunch from frozencpu.com.
The only problem is it doesn't seem like they keep me awake...coffee does a better job (but even with coffee I usually have to have at least 4 cups before I start feeling a little hyper). I mostly love energy drinks for their taste, they have a different taste from regular soda.