i say leave the rears stock just so you have somethin back there, amp a nice set of front comps (make sure to deaden your doors well), return that q logic no matter what, and build your own box.. it is seriously easy, and its soo worth your time. if youre stuck on sealed for the response, thats cool, but output will suffer a lot. and as it is those type Rs are kinda power hungry.. you shoudl either port low in a small enclosure, or use a box about the size that .88 box is..
but whatever you do.. put more power on that type R.. ESPECIALLY if you seal it. sealed id suggest almost 1000 watts.. ported prolly about 750.. and if you set your gains right youll be verry happy with output (metal is nice with good sub and midbass output)