Neostigma
Just a tip, i advise not drinking too many energy drinks as they're amazingly bad for you. Imagen your heartrate being that asif you're running a marathon but you're actually just sat playing a game for maybe 6-10 hours, as C'thun has said before "Your heart will explode!" =D
(I read about a few people who played WoTLK for massivly large amounts of time in a row on release, just drinking energy drinks and ended up getting seriously ill or dieing, which is bad times ^^)
Fresh fruit is most advisable and take some short breaks inbetween for some fresh air.