There's nothing wrong with leaving stock speakers back there for rear fill purposes with primary sound coming from the nice replacements you have chosen, however, pay attention to the ohm load of the stockers vs your aftermarket choice. I would think you could turn the gains off on the rears and bump the gain a hair...maybe 1/8th-1/4 for the fronts. I think you have a good plan. You should also pick a sub.
2014 GMC CC Z71, 2009 C6 vette (672/639 at the wheel and less than 3300lbs)
2010 Camaro 2ss/rs---SOLD 4/15/14
-654whp with a few cosmetic things, Pfadt suspension, Vortech, CircleD, GPI ss3 vvt bump stick, gears, stuff in between,18" TSW N'rings for drag duty, 20" Forgestar F14s for street.
rhino@ Gwatney Chevrolet/GPI Jacksonville AR
TCAudio in Benton AR