I just purchased a new NAD M3 integrated amplifier to go with my new ProAc Studio 140 speakers. Now I want to upgrade my NAD C542 cd player. I can get a deal (about $2,000 after taxes) on a new NAD M5 cd/sacd player or a used (1.5 year old) Marantz SA-11S1 cd/sacd player. Any opinions on which way I should go?