Best Sounding Portable CD Players???


I just bought a used Headroom Cosmic headphone amp with the BaseStation power supply upgrade through an auction here on Audiogon. I am looking for advice on the best sounding portable cd players out there to replace my 10 year old Sony. I will be using Sennheiser 580s with this setup. Headroom recommends the Panasonic SL-SX460, and I remember reading something in Sensible Sound a while ago about a good Optimus unit, but that's all I know about portables. Any advice out there on portables I should listen to?
hifiguy
For the best sound, I would think a current portable cd player, such as what Headroom recommends would be the best. The Radio Shack 3400 is a good sounding player but is a few years old and may not be repairable. It does have a coaxial digital output, which few (if any) other portables have. It is a competent, but not great, cd transport and needs some form of jitter reduction device to work its best. There are a few current Sony portables that have toslink digital outputs but I do not know how they sound. My experience is only with the Radio Shack and I will not sell mine.
Thanks for the advice, guys. I think I will stay away from the used, discontinued stuff like Optimus CD3400s, especially when I can get a new Panasonic SLSX460 player for well under $100. What I am looking for here is other current portable CD player comparisons so I can narrow down the choices of what to listen to before I buy. Are there any other portables out there that sound as good or better than the Panasonic SLSX460 in your opinion that I should be listening to? Also - Jeffloistarca, can you expand on the sound of your setup? Did you audition any other portables and notice any differences? Thanks.