Separates Newbie??

 As the title says I am new to using separates. I’ll be brief as possible. Have the opportunity to purchase a B&K 200.7 or an NAD T973 with new nippon caps. Within $100-$150 in price, T973 higher. Like the fact these don’t produce in your face higher frequencies. After research sounds like I can’t  go wrong either one sound wise, my main question is which one would withstand sustained higher volumes better?  It will be used for home theater and music/music DVDs. Heavier on the music side.  My speakers are revel F32 and C30 with PSB surrounds & JL Fathom110. 5.1 system. Current receiver is Integra DTR 50.2. Will use this for preamp. Not enough juice for Revels. A 5 channel suggestion under $1000 is appreciated too. Keeping in mind sustained volume. 
Thanks in advance