Hi kiteflyer45
I've had both of these cd players in my system within the last year or so because I needed a "temporary" something to use as I was having a dac built in the UK. I've had a chance to listen to them both in a system I'm very familiar with. For under $1000.00 they both sounded very nice.
The Marantz CD6006 is a very good well rounded cd player that performed better than I expected. I was surprised that they were able to give you so much sound quality for under $500.00, the technology has really come a long way.
The other player that surprised me was the Rotel model CD14, it's strength was it's bottom end was very solid. They also make a $1000.00 cd player that I would like to listen to.
I don't know what your budget is but I can tell you that I was shocked at the sound quality from the Yamaha CDS2100 I owned for about 2 years. It was way better than I expected. Yamaha definitely knows what they're doing. They make their own transports (which seems to be the weak point of a lot of these cd players over time) they're drawer mechanism is very smooth and quiet when you open it, it's also metal, not plastic which I really liked. Another benefit of the Yamaha player is it also plays sacd's. The tonal color and timbre of this player was absolutely gorgeous. The player is built like a tank and weighs about 34 lbs. The retail is $3000.00 but you can find them for less. Message me and I'll let you know the whole story.
Good luck with whatever you choose.
Scot