Optimizing my CD Source - what to do?

I've been following multiple threads on the topic of "Best CD Player for under $1000, or $1500, or (insert your budget here)", or similar.

I really need some assistance with the following questions:

If my budget is $1500 (preferably closer to $1000), and I'm interested primarily in Redbook playback -

1) Will my money produce real, obvious benefit over other players I've tried (see below), and the Sony DVP NC555es 5 disc SACD changer I'm currently using?

2) I'm running an Audio Mirror D2 NOS DAC; will I be just as well off getting a lesser player, or transport that has less in the way of processing but presumeably a comparable transport? For example, would the Rega Planet perform just as well as the Jupiter if I'm using the AM DAC?

3) I'm considering Rega Jupiter or Apollo, Musical Fidelity A3.2, Meridian 502.24. Any recommendations?

Backgound:
- My system consists of a Musical Fidelity Nu-Vista preamp, B&K M200 Sonata amplifiers, Totem Mani-2, Rel Storm III sw, various IC's, PS Audio statement spk cables, Pink Triangle 'table w/AQ PT6 arm, Grado Reference Sonata cart.

- I have tried multiple single disk players, including NAD C541i, Denon DVD2200 univ/sacd player, Sony DVP s7700, and none of them materially (indeed noticeably) outperformed my Sony DVP NC555es 5 disc SACD changer (ie on red book)