Well i've been lurking arround trying to find out what to buy for my k702 for some time. my budget is 800euro.
Right now i own an essence st, with opa827 on brondogs in the IV. listening through the hp out.
From what i read, it came down to eather the schiit combo (Lyr+bifrost) or the HA-160DS.
I have to note that the essence, specifically the opa827 have me addicted to a 3d sound stage (do not know if it is correct, but i verry much appreciate the illusion of sounds somwhere behind me, does wonders for movies and games :P), so i would like to keep that, or outdo it if possible. Also, the k702 are said to be very detailed, i would love it if the dac/amp combo i get were to bring out the full potential of these cans :D