Thanks everyone for the advise - yes, I expect that cable upgrades will be next on the agenda - whenever I get the scratch. I'll probably consider Nordost SPM Reference, Quattro Fil, Cardas Golden Reference and FIM Gold.
Not sure what CD player I can get that would take me to any new level - the YBA delivers nicely, even though I agree it's a bit over the hill at this stage. Perhaps an Audio Aero Capitole would be a nice improvement bit a little expensive for me. I wonder would a Naim CDX or BAT VKD5 do the trick?
On the PS Audio Power Plant problem - it's managed to blow the fuses on my Pioneer Elite DV09 DVD player three times (and it takes a half hour to open up the chassis, change the fuses and close the player each time). Also, it has blown the fuse on my Line 3 preamp power supply, and my preamp sounds like it's ready to blow up even when I have the powerplant on regular Sin - hence I don't plug it into my power plant any more. Power capacity is definitely not a problem - the power capacity is never over 130watts when I had my preamp plugged in. Without the preamp plugged in, the power registers as zero. It just seems to want to destroy my equipment with a vengence. I've sent PS Audio and e-mail a few days ago but no response yet.
Anyway, thanks everyone for the advice.