Another What "DAC" Would Be Good for CD OPT Output Use.

I have been around long enough on forums to know that the same old tired question comes up depending on what kind of forum your on. So first let me say thank you in advance for taking up digital space on this section.

Short and sweet. I just picked up a new Yamaha CD 603 CD Carisel Player. It has an OPT output as well as Analog. I know there are much better DAC's, but having been in the Pro Audio Business and Worked for Yamaha Repairing there Pro Audio Large Format Mixing consoles, I like there Quality.

Here's the info I would like from the experts here. I would like to add a higher quality DAC to the Audio chain thru the OPT output of the Yamaha. I don't need a 5 Bazillion dollar DAC but one inline with the $600.00 price of the Yamaha CD

So...What price range would you suggest as well as Make and Model.

The Playback system consists of a Marantz 3300 Preamp Driving a Marantz model 250 Power Amp for Hig 's and Mids and a Marantz Model 500 Power Amp Driving the Lows. There is also a Marantz Model 150 tuner in the system.

The Speakers are 4 Electro Voice Sentry III Floor standing speakers. Two Per Side. One turned upside-down on top of the other so that the two horns mate in the center. So that's 4 15" Lows 4 120* tweeters and 4 120* Sectoral Mid Horns

Thanks In Advance.

Mark R