I’m looking for recommendations for a mid-range receiver. This will be used with four Definitive Technology BP-2006 tower speakers, along with a center channel. According to the manual for the speakers, they’re best running at 4 ohms. The room size is about 17’ by 25’. I’ll be playing music and watching movies. I was thinking the Onkyo TX NR626 or the Yamaha RX-V475, but open to suggestions. Will be using it with a Roku box, blu-ray player, and a cable box. I'm a novice to this, and would appreciate any help. Thank you.