Sonic Defender
Headphoneus Supremus
You would be able to spend very little and get the Topping L30 II for example and should expect excellent performance. There would be no reason that spending more money would yield any audible benefit as the Topping has plenty of power and is audibly transparent in every way that matters. There are of course other considerations why we like to purchase more expensive than absolutely required gear, no judgement at all meant, but if anybody is looking for the bang for the buck feeling, the Topping amp would provide that.