car audio - component speakers front and rear? or mids in rear? THANKS?

[NickPierce]

i have a 2004 safari van, im upgrading ALL SPEAKERS, installing two 12'' subs to a amp. Then running my 6.5'' speakers and 4x6(is a 4'' speak and tweet) speakers off the head unit. Question is, should i put 6.5'' components in the front and rear with 4x6 in rear, OR 6.5'' component in front with 6.5'' mids and the 4x6(4'' and tweet) in the rear? I already ordered the mids and 4x6(4''&tweet) for the rear. SHOULD I SWITCH THE REAR 6.5'' MIDS TO 6.5'' components? ONLY 8 BUCKS MORE. Or is it noT gonna make to much diffrence? SINCE THERE IS 4X6'' PLATES IN REAR TOO? any insight is helpfull! SINCE I HAVE THE 12'SS IM NOT WORRIED ABOUT THE BASS, I JUST WANNA MAKE SURE I CAN HEAR THE WORDS TOO. THANKS- -- ADDITIONAL NOTES i was gonna get 6.5'' and 4x6 two -way speakers, then realilized components were the way to go. my front door has a stock tweeter in it already too, that i plan to leave IN and add the new component around, so id have 4 tweets-and 2 6.5'' in front , and 2 6.5'' mids- and 2 4x6(4'',tweet), and 2 12'' subs in rear and stuff is power precision and american bass amp is a oldschool power 851. THANKS FOR YOUR INPUT! ANY ADDITIONAL TIPS OR HELP WILL BE HELPFULL.