Sony SCD-XA777ES or SCD-1


Current player: SONY DVP-S9000ES. Considering upgrading to one of these:

- SONY SCD-XA777ES new, $2500
- SONY SCD-1 Used, but mint, $2500

Amplification is PASS LABS Aleph P + 3 + 0s (bi-amp)
Software: 90% CD, 10% SACD
Musical Types: Jazz and Rock

What do you think?
sony
SCD-1 as TRANSPORT only to outboard dac for redbook. I am finding the Audiologic 24MXL dac simply fabulous. SACD is good on the SCD-1, but with the above suggestion, you would have all the bases covered (budget-dependent suggestion of course).
I agree with all the opinions. Thanks!

About SONY Transports:

Models CDP-XA7ES, SCD-777ES and SCD-1 use a floating suspension chamber-transport mechanism with a brass weight securing the disk in place. The optical group is fixed, the disk moves (and spins).

Now, more recent models SCD-XA777ES and SCD-XA9000ES use a different mechanism (without the brass weight). But the catalog description says the optical group is also fixed.
Is this transport better? DO you know how it works?