Try the Pioneer 575a as a stand alone player. They are not bad. Then experiment by adding a Caiman.
I've tried my 565 (basically the same but without DVD-A capability) with a Young DAC and I didn't think it made much of an improvement, if any, but that may just be me.
Of the many players I own far and away the best is the Technics SLP1200B but they are scarce and reliability due to age and use is an issue.
I also have a Pioneer 737 and I wouldn't recommend it - too plasticky and it packed in after a short time. Not tried it as a transport, though.
Cheap and good option if you can find one is a Sony XB790QS, for me it comes quite close to the Technics. Does SACD too.
Current Lash Up:
TEAC VRDS 701T > Sony TAE1000ESD > Krell KSA50S > JM Labs Focal Electra 926.