Which one...?

I've had my Bel Canto CD-1 for awhile & although very good I want to upgrade but not to stratospheric heights financially!
From research I have this shortlist:

•Accuphase DP-500
•Esoteric X-03SE
•Marantz SA-7S1

Many of you guys are very knowledgeable so I ask which would you choose & why...& do you have any alternatives?

(If I had the funds I would get a TSD1/DAC 2!)

Thanks