topping pa3 is around 110$, emotiva basx a100 229$
ifi zen dac 129$(if you want warm sound), donald dac 99$, topping d10 90$
cambridge audio axr100 499$, sprout100 599$
some suggestions to check out. onkyo and harmon kardon stereo integrated are also good for under 500$, but are avr size units. first line are amps, then dacs, then integrated.