Since we're on the strat-talk forum, I assume you're talking about strats . . . which are solid body guitars. They're pretty quiet on their own. They need to be plugged in.
#1. Speaker/cabinet
But I would re-order your list this way:
Pickups
Neck Wood (meaning EVERYTHING about the neck: weight, size/back profile, truss rod construction.)
Bridge (a strat bridge is a HUGE hunk of metal and the strings are anchored to it.)
Body Wood
Body thickness
Strings
.
.
.
Nut material
Last edited: Sep 29, 2014