Hello I'm currently taking recommendations on amp and dac pairings for my HD800S. I would appreciate recommendations in tiers from low price points to mid to high. What I'm looking for are combinations that take advantage of their clarity and imaging but aren't to sterile or dry sounding. I want a little bit of kick to them but nothing overly warm or dark. Also a bonus would be combos that scale well with other Sennheiser cans such as the HD600/650/58X/660S as I would prefer to not switch around amps often. Any help would be greatly appreciated thank you.