Your average run-of-the-mill CD will only play at 16 bit resolution. Anything higher than that you'll have to dither back to 16 bit and try not to lose detail. The POW-r 3 dither the latest version of Sonar uses -- it's pretty amazing at maintaining the illusion of the same detail as 24 bit.
But you have to consider first, why do you need that much resolution? If you make a recording with that much detail you're going to hear every rustle of fabric from your clothes moving over the background drone of your CPU cooling fan. If you make any mistakes at all -- accidentally tap your foot on a weak floor board, spin slightly in your swivel chair, or maybe the foundation of your house decides to settle a little bit during one take -- you're going to hear it.
I usually record straight to 16 bit at 44.1 khz, the same rate it plays on my CD's, without a really noticeable difference. And in a lot of cases, a lesser resolution gives me more control over the sound when I want to move it to another place and create the appearance of a seamless take.
If you really want to hear your CPU fan in the recording for some reason, then go 24 bit all the way. Me, I'm happy knowing that if I really need the extra detail I can record it, but for most everyday recording purposes 16 at 44.1 is just fine.