Welcome to the forum!
-rc-monster revo motormount; it's a direct bolt-on for the stock nitro mount
-Y-cable (in order to use the mech. brake and the speedcontroller at the same channel)
-UBEC (to feed the receiver with 6V)
-rc-monster 1/8th diffs
-brushless controller (quark, MGM or Mamba Maxx)
-brushless motor (Neu (can only be used with the Quark or MGM controller) wanderer (can be used with all named controllers)
-MOD1 pinion
i don't know what your goal is; racing, bashing? this would help in choosing the batteries.
Please read this thread; it might be helpful in picking a system;
http://www.rc-monster.com/forum/showthread.php?t=5115