RF Power 1000 and RE Speakers

OK, here is the situation. I have a set of RE XXX comps that are 2 ohm and a RF Power 1000 amp. The RF amp is rated 100 x 4 @ 2 and the sub channel is either 300 x1 @ 4, 600 x 1 @ 2 or 800 x 1 @ 1. I already have two XXX 12's in the trunk so with the sub channel on the RF I was going to run some 8" in the cabin. I know you are supposed to keep all your subs the same but RE doesn't make a XXX 8" but I did find some RE Series 8" that are rated 175rms. Would it be ok to run these along with my other subs? They are D4 so I could either run 2 at 4ohm or 3 at 2.6ohm. I will also be using the RE 6x9 in the rear deck wired together to get them to 2 ohm and I am going to make a center channel too, so will adding the 8"s just be overkill? Thanks for your help!