two things u can do here
get quality components up front, and a quality woofer in tha back, this will require u to have an amp,
other cheaper setup is to get components up front, and coxials in the back
for the first setup, i would suggest polk audio momo components, and polk audio momo 12inch woofer
with fusion amp.
for the second setup, i would recommend polk audio dB series components upfront, and db690 in the back. using a amp in this case is up to u. polk audio dB series sound very decent without an amp.
if ur going with MOMO or MM series. make sure u amp them, its worth the effort.
im using db series in the front, momo woofer, all off 4ch amp. i have db in the back aswell, but i keep them off, i find its clearer when just the fronts are running. thou not louder.