I have Nola Boxer 1’s that I’ve been driving with a Creek 5350se integrated amp ($1500 in 2002, no longer available, sounds great with the Boxers but has developed reliability problems with ALPS input switch). Before I decided to go up-market I was seriously considering a Yamaha A-S801: https://www.amazon.com/dp/B00N625HZ2. New, it's +$100 your budget amount but from my research worth the stretch to pair with the Boxers. So 2nd’ing what Yogiboy said.
ps: the Boxers benefit heavily from good stands. I use Dynaudio Stand 4 (~$400) - save up and get some (or equivalent).
ps: the Boxers benefit heavily from good stands. I use Dynaudio Stand 4 (~$400) - save up and get some (or equivalent).