I am looking at Front and Center Speakers (NHT M5s) which are 6 Ohm or PSB strat Mini's (4 Ohm). I will be using the Energy Encore (8 Ohm) speakers I have now for surrounds as I don't have the funds right now for the whole set-up. Will this be a problem? Also, I have an earlier post, the M5's or the Stratus Mini's. Any help would be much appreciated.