I have a chance to buy a onkyo a-sv620 or sa-ax720 i was wondering witch one is a better buy i know they both are about 10 years old but in mint condition i will be running two tower on them with double 10in woofers and two jbl power subwoofer 250 watt rms 500 watts max and a 125 watt rms center and 100 watts rms surround any suggestion would help greatly mostly used for music movies on weekend