Have you had Naim Gear in your system before? Its got a sound all to its own and not everyone likes it so listen before buying, also consider all the dedicated wires (DIN) and power supply's you'll need. Nothing in the Naim world works well with others.
I personally would go with the Lyngdorf over the Naim for simplicity and sound quality, also if your going to have a built in DAC may as well be an all in one DAC-AMP with the outstanding room correction added in.