I want to buy a "best man" gift for a friend of 30 years whose receiver is fried. I would like to spend $500.00 to $600.00. If I could buy him a top-of-the-line receiver, I would know what to buy, but I don't know what to buy in that price range. I know he favors Yamaha, because he admires their engines, as I do (he had a Ford Taurus SHO at one time). I saw a Sony STRDA-1000, $600.00, in Tweeter that was very impressive looking, and it was heavy, but I don't know what it sounds like. So, what's the best deal for the dough, guys?