You've got decent gear. It works. you pull recordings you like.
why change it?
spend your money on new speakers, new amp...higher end playback setup.
then you'll really start to hear what you want to change in your recordings.
but, if I have to throw down useful suggestions, I'll echo the ditch your current setup suggestions and go w/a MOD'd UA5 / Iriver
too bad you dont have the funds for an ACM660 ?
(marantz deck, moded' by the oades...killer all in one box).