I'll beg to differ with the 1st reply as it sounds like rehashed heresay.
HDMI, optical or coax(unlikely on a laptop), streaming (wired or wireless) all sound the same. The only downside to wireless I have found is if you get too far away, or try to do too much at once, and then "less quality" is basically drop-outs. If you are playing music only, then it's the same. I have A/B'd my squeezebox on wired/wireless and it's identical. I have been using it on wifi for a year or 2 now, and had zero dropouts in that time. Good enough for me.
But the best way?? well.
If all you have is a NAD amp, then the ONLY way is 3.5mm jack (headphone socket) to twin RCA unless the amp is one with a digtal "in" and assuming your laptop has digital out (usually a dual headphone/spdif socket)
You could do it lots of ways if you buy one of many DACs. I personally would recommend the Beresford range. USB, including good quality headphone amp at a very good price (I have 2!).