The C545 is almost similar to the C542, smooth, warm and relaxed, halos wala ako makitang difference and I think advantage pa din ang C542 kase may HDCD decoding ito. Mas gusto ko tunog ng NAD compared sa CA Azur 540/640 cdp and Marantz CD6003 though I bought the Marantz kase 'yon lang ang kaya ng budget ko for the meantime and previously, I owned a NAD C542.
But if you have some currencies to burn, try to audition the Consonance Linear 120 cdp, ganda ng tunog. IMO, still at the end of the day it's your ears that will decide what to get.