I am looking to upgrade from my Sony STR-DB925 to a Pioneer VSX-D2011. I'm particularly disappointed with the standard stereo performance of the Sony and need to be reassured the Pioneer will give me a significant upgrade. I'm confident the AV performance will impress and, as I'm using std 5.1 format, am optimistic biamping will do the business. Any comments from current 2011 owners will be much appreciated. Also the cheapest I can find it for is £694. Anybody know of better?