Matching power at maximum rating for?

Hello everyone. First off I'd like to thank everyone at the forum who has helped me along the ways. I have learned a great deal and have been enjoying my music listening a whole lot more. So after a month of annoying everyone in the forum and going out and auditioning I finally got this set-up.

Totem Rainmakers (Sonus stands)
Nad c320bee
SB2 Modified
Straightwire octava II
Analysis Plus Oval and Straightwire Interconnect (haven't decided which to keep).

Had my friend over and he told me that I needed to change my Nad because it's not powerful enough. It can drive the rainmakers but not to it's full potential. He told me that most people never match the speaker at the recommended power level but match the minium. According to him this requires to speakers to work alot harder to produce the sound and usually wear down speakers quicker. Now is this true? If so what kind of Integrated do you suggest or power amp can I purchase used here on audiogon for around 5-600 dollars?

Keep the NAD. Dump the friend. Or at least, take anything he tells you about audio with a huge grain of salt. Speakers don't "work hard." They take what power you send them, and they do the work. If you're trying to fill a cavern with ear-splitting sound, the NAD isn't powerful enough. But if that's the case, you'll know it. (As in, you'll hear it.) If it sounds ok to you, then the NAD is plenty powerful enough for your system.
I would agree with Pabelson. Your speakers require 20 watts minimum and 100 watts maximum. The NAD is rated at 50 watts. Unless you're trying to fill a huge space this should be more than enough.
Thanks I was pretty sure that's the case. Oh well there goes another friend :)
Good advice from Pabelson. You've got a perfectly fine setup and the important thing for now is just to enjoy it.

After you've listened to it a lot, with all kinds of music at different volume levels, you'll be able to accurately judge what you're hearing from it and, more important, you'll have a reference from which to compare other equipment if you decide to audition something new.

Ultimately you might find a higher powered amp you like better but it's probably just as likely you'd enjoy a lower-powered but higher-quality amp. It's a waste of time to start thinking about that now, however. Listen and enjoy.
Yep. If you start hearing strained or distorted sound, then it is time for a larger power amp. If it sounds sweet and smooth at the volume levels you like, more power wont do anything but empty your wallet.
The friend is totally wrong.
The actual real thing is that IF the amp is 'underpowered' and causes 'clipping' of the waveform, then the speaker (often) is damaged. (Usually the tweeter blows).
This happens when a low powered amp is forced to play VERY VERY LOUD.
If you are not playing at heavy metal rock concert levels... you do not need to worry.
The idea that the amp has to match the highest power levels the speakers can handle is clearly incorrect.
It IS TRUE that the amp has to be able to handle the highest power levels you wish to play it at, without being overloaded.
If you hear no audible distortion at the loudest levels you play music at, your amp is doing fine.