as the other respondents have opined, there's no compelling need to get a separate dac if you're buying a rega planet, which has a superior inboard dac. if you like the idea of more gear (and who doesn't)you might consider getting a cheaper player to use as a transport (e.g a cambridge 540 or garden-variety nad) and buying a separate dac, such as the cambridge dacmagic; however it's a matter of opinion as to whether this will give better performance than just the rega.
Considering a DAC and need advise
I own a McIntosh C28 preamp, MC2105 amp, Paradigm V4 Studio speakers, and a Rega P3 phono. I am most likely buying a Rega Planet 2000 (used) and need advise about a good DAC for the money which matches my gear in terms of performance. I really don't fully understand the necessity of a DAC. May I have a concise synopsis as to why this will be so important?