if u are gonna have a sub in future go for 6992 s. they give better mid's and overall the sound is good.
the only good thing about 718's is that they give a good bass. but isn't that the job of a subwoofer. 718's have too much shrill or treble at high volumes they hurt one's ears. i used them some time ago for a while and then changed them.
a better speaker than both the 718's and 6992 s is the pioneer d 6902r do listen to it as well u will love it.