Okay, I need some advice from you experts on this one... I've been offered (second-hand) either a Yamaha DSP-AX620 or a Sony STRDB940, each for £150. Both are in good condition, have little use and are working well. Not bothered at all about the RDS bit of the Sony, and I will use the pre-out option from the amp for the main speakers to be powered by my valve hi-fi amp. So I'm really only worried about the quality of DD/DTS decoding and quality of amplification to centre and rears. I presently use a DSP-E492 with the DD decoding being done by the onboard decoder of the LG-3350E DVD player. Any advice would be much appreciated!