mindcrack is a server that lots of youtubers play on including: Paulsoresjr, Etho, Guude, Pauseunpause, GinerikB, And Many More!
it really all depends on what you want. if you want lets plays go to channels such as: vintagebeef, guude, generikb, monkeyfarm and many others. If you want redstone check out sethbling and if you want minigames check out skydoesminecarft and some of his friends.
TobyTurner, SkythekidRS, Honeydew, Xephos, AntVenom, CaptainSparklez, monkeyfarm, Notch, deadmau5, LividCoffee, Sips_, Sjin, inthelittlewood, LikeTotallyToby, Etho, BdoubleO100, generikb, Guude, adlingtont, AnderZEL, Arkas, Avidya, BlameTC, Docm77, jsano19, kurtmac, mcgamer, Mhykol, Millbee, Nebris, Pakratt0013, paulsoaresjr, PauseUnpause, Pyro_0, ShreeyamGFX, thejims, VintageBeef, Zisteau, W92Baj, Coestar, SethBling, GameChap, BertieChap, BebopVox, Sacheverell.