hello i now own a yamaha dsp-a1092 whitch i mainly use only for stereo whit mission 702e and everything is okay for me but now i want to go one step further and use it for dolby pro logic using mission 704 for front 702e for back and a 70ase subwoofer my question now is for the center speaker i have two options using a 75c for center or two 700 normal speakers because i already own these and dont now if i will buy a 75c what do you think stick whit double 700 or buy the 75c what will be the best result help me please thank you very mutch