Is less than 24 bits worth it?


I see so many attractive CDP's for sale on this site that have 18 and 20 bit resolution (Naim, Theta, Classe, etc.) Does it make sense to still buy one as a stand alone or should I only consider 24 bit? Thanks for the advice.
easy_e
With all of the above having been said, what are some reccomendations for a used player in the $1k range? I use a Classe CAP-100 and Spica TC-60's and listen to mostly all kinds of music.
hahah.... looks like Ghostrider said it all and Jond and i were typing the same exact things at the same exact time. Look at our opening lines : ) Sean
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My first CD player, a Mission unit, had only 14 bit D/As, (oversampled) but was vastly superior to contemporary Sony units which boasted 16 bits, so I agree with sean (for a change). That being said, and all things being equal (which is not always true) 24 bits has potential for sonic improvement if the rest of the circuitry is up to it.
Let's not forget jitter affect on resolution!
Both circuit noise and data dependent jitter can easily "disqualify" the significance of additional least-order bits in a 20+ bit system. The intrinsic jitter from the oscillators that control the coax or Toslink connection to the DAC can destroy any hope of resolving near 24 bits.