Best format for SteelyDan...

I have virtually everything by "The Dan" including solo stuff on LP, CD or SACD. Hoping to find recordings that improve sonics over the pre-Aja CDs; in particular, "Pretzel Logic" "Katy Lied" & "The Royal Scam". Are the "re-masters" the way to go? Have these 3 even been re-mastered?

As an editorial comment, I don't understand why these guys don't have everything re-issued in some kind of hi-res format. If you know otherwise - please advise!
(fwiw - I'm running an upgraded Denon 2910 "universal" player). Thanks in advance for your advice. Ciao.