I've posted my findings on the PS1 on this thread:
http://forum.audiogon.com/cgi-bin/fr.pl?ddgtl&1176210779&read&keyw&zzplaystationFor a little fun in changing the appearance of the PS1, check this out:
http://www.interesting-devices.com/asp/product.asp?recorprod=1&product=192&cat=62&ph=&keywords=&recor=&SearchFor=&PT_ID=I'm going for the smoked black case myself, but the blue one is attractive too.
As for trying the cro-treated IEC/C-7 adapters with IEC power cords, my friend tried one with his Kimber Select power cord and thought my PS Audio Power Punch C7 sounded better. Afterwards, he bought one himself and hasn't looked back. I have no doubt that the Kimber Select PC is a fine power cord, but one more interface in the power chain might compromise the sound a bit. On top of that, the PS Audio Power Punch C7 fits snugly inside the Playstations C8 recepticle. For only $50, I was very impressed with the quality of construction and the flexibility of the cable. Since the PS1 uses a potentially noisy (RF noise) switch mode power supply (SMPS), the shielding drained to the ground pin on the PS Audio power cord really helps in improving the dynamic range and frequency extension at both ends. My recommendation list on improvements with highest to lowest priority is:
1. Good-excellent RCA interconnect cables
2. Isolation feet like Isonodes or round 3M Bumpon feet (x3, two under front and one under rear)
3. Power cord replacement with PS Audio Power Punch C7 or other C7 power cords like the Furutech G-320Ag-18F8 or Oyaide L/i 15 dpc (recommend using a continuity checker to identify correct polarity)
4. Clean all audio and power contacts with residue-free contact cleaner
5. Replace power supply fuse with either Isoclean or Hi Fi Tuning 5mm x 20mm audiophile fuse. These really make a big difference and for only $25 or $30, it's a bargain.