I saw an Adcom gfp-555II on CL for $125.00. This is a good price but I don't need it unless it would be a noticeable improvement over my gtp-450. And I'd have to weigh the fact I'd lose the tuner. Where the Adcom system is the tuner sometimes is handy for background. But if the 555 was better than the 450 for sound quality I'd make the trade.