I have a Denon 3910 and it plays all discs exceptionally well. I have considered getting a "dedicated" redbook cd player, but it just doesn't make sense- the 3910 is really, really solid hi-mid-fi, imho. You might, MIGHT, get better sound quality out of a stand alone transport with a seperate DAC, but you are talking alot of money for not much in sound quality. Like these guys keep telling me, if you are looking for noticeable sound improvement, speakers and room treatments are the best bang for the buck.
I say try your 3910 and see what you think. I have compared mine to 3 other players and it is the best.........