I’ve wanted a pair of high end headphones and recently Monoprice had the Monolith planar magnetic M1060 headphones on sale so ordered. I’m now trying to figure out the right DAC/Amplifier that will power the headphones adequately while also working with an iPhone. Portability isn’t a major concern especially if it compromises sound quality. Looking to spend $300 or less so not on the higher end of course, but not wanting to go too cheap and thus needing to start over again. Anyone an audiophile with experience have suggestions?