I've bought a lot of gear over the years heading down the upgrade path. I can say one thing with absolute certainty, I will never buy another CD/SACD or DVD-A player to spin my CD's. Computer based audio is the only way to go. With a good conversion, PC based systems sounds significantly better than CD players at nearly any level.
The first thing you need to decide is how you want your music served up, non-oversampled or upsampled. This will likely completely system dependant. If you have a relatively 'laid back' system sound, look towards upsampled. If your system is a bit more forward or bright, go NOS unless you are a detail freak (and don't listen loud).
After that choice, you need to decide if you want to USB, wireless or PC card then use the digital out to a DAC. More and more decent sounding, relatively cheap USB DAC's are hitting the market (read=under $500). The wireless route is extremely good but it in its modified version will tip the $1k mark (with a cheap power supply). I can't speak to the PC card version but there are many who swear by it.
Me, I do the wireless thing (Bolder SB's). Of all that I've heard, it sounds the best. Far better than any of the uber expensive CD/SACD/DVD-A players I've listened to over the years.
Trust me on this one, CD players are going by way of the horse and buggy.