Just joined the HD6XX drop and now I wonder what i should buy to get the full sound out of them. Sould I buy a dac and amp or one of them only. I have already bought the Zorloo ZuperDAC for portability but I need something for my computer at home. I was considering something like the Topping D30 DAC & A30 Headphone Amp combo but now it has ended. My budget is around 200 dollars. Thanks!