Good CD Player for Headphone System?

What's a good CD player for a headphone system with Sennheiser 600s and a Corda Headamp? Do hi-end CD players really make a difference here? A small box would be nice. Thanks.
The NAD L40 is a CD and Integrated amp in one. 20 watts per channel and sounds amazing for the cost. I got a "new" B stock for $399. I use mine to drive the Energy speakers on my deck with amazing results for this price point.
Hope this helps.
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