Welcome to the party, estill!!
Battery - Any decent "Shorty" 2s lipo. Good stuff is inexpensive and easy to find. No need to overthink this one. Turnigy (from hobby king), SMC racing, etc, Check to see what your track sells, if they're within $10-20/pack, give them the sale. Ditto the rest of the stuff.
ESC - Hobbywing XR10 "Justock". No need for anything more, unless you know you'll run modified in the future.
Servo - 100oz/in torque or more, as fast as your budget allows. MUST have metal gears. These cars don't have servo savers anymore.