I currently have a three year old Yamaha DPL/DD5.1/DTS AV receiver. I am toying with the idea of upgrading. I notice most amps now have DPL2 as standard. Is it any good? How does it compare to DPL1? How does DTS neos compare? Is it worth having? Any suggestions on replacement would be appreciated. Tempted to get a new Yamaha as I have been well impressed with my ccurrent one Thanks.