Recommend upgrade for NAD C541

Does the NAD C541 have a IEC power cord socket? If you are using the stock cord that came with the player, try something like a Blue Circle BC61 power cord ($83 shipped), before you spend more on another CD player.

This is a no brainer, because you will want a better power cord, even if you end up getting a CD player in the end.
A better cord for the amplifier would not hurt either.

I say all this because your system looks well balanced. While you will notice an improvement from a better CD player, you would probably also need a better amplifier to fully take advantage of the upgrade.

Try something simple before getting on the never ending upgrade roller coaster.

I like the NAD CD player for the money. I am not a fan of this integrated amp, which doesn't provide much detail to my ears. I think you would see more improvment with separate amp/pre-amp from another vendor than you would with a new CD player. If you are considering buying from a dealer, haul your CD player and integrated into them, and A/B your integrated against a separates setup in your price range.

I think you would have to spend a lot of money to get a significantly better cdp, and then you might not be able to appreciate the upgrade. Your speakers are your weakest link, not your cdp, and not your amp. Their bass through mid-midrange are affected by some coloration resulting from the material the woofer is made from. The tweeter and the woofer are not really well integrated off axis, either. If you don't play them real loud (harmonic distortion will increase with spls), you might experiment with their placement in your room and make sure you're listening on-axis.