I'm willing to bet that the Bryston has more dynamic headroom and is also more likely going to have higher agility with impedance curves. However, it's likely the only time you will notice the NAD having trouble is if it's pushed beyond it's parameters of operation. As I stated on your other thread the most significant adjustments that you can make are positioning and acoustic treatment. If you haven't treated your room then you need to, it's far more cost effective than upgrading your amplifier and will produce positive results that will come no where near to the difference a small upgrade in power would make.
Walter, you likened comparing Chevy to Ferrari with NAD to Bryston. In some regards you are correct. The Bryston is going to have a higher power capacity, no doubt just like a Ferrari has more power than a Camero. However, if you don't go 200mph down the country road you will never need to have that extra power. Compare the top end Corvette to the Ferrari and the Ferrari has a close competition, only the power difference is almost negligible for almost every situation other than just a top speed or acceleration test. In the real world both cars are exceptional machines, but one carries a significantly higher price tag for a slight increase in performance. Basically, you are paying for the name.
If I want to get more power I know exactly where to get it, and I don't have to spend a fortune to get TONS of good, clean, and linear power. I'm not going to throw any specific models out here but I would suggest that the OP look at more cost effective amplifiers that will deliver a more significant amount of power than 60wpc. I would never spend $2000 to get such a low amount of power, regardless of the warranty. My little Niles SI-275 is a chunky little machine and is designed specifically to handle reactive loads and would probably run within the same spec field as that Bryston at a fraction of the cost. It's rated 75wpc @ 8 ohms and it's stable down to 2.66 ohms. It runs cool all the time and has a small form factor. You can pick this amplifier up for less than $300. I only use that as an example of a comparable amplifier that is built to a high standard. I would not recommend it specifically for this use because it would be an insignificant upgrade from what Jason is currently using. If you want more power, get something that can solidly produce at least 200 watts per channel at the minimum.
I still suggest tackling room acoustics first.
Edit: I see some of what I said has less merit now that I see Walter was not aware this was a 60wpc amplifier we were talking about.