Well my intention for those headphones are purely gaming, I already own a pair of Sennheisers hd650, a pair of Senn HD555 and a tritton true 5.1 gaming headset, I wanted to replace the headset, and I read in MANY forums that the AD700x are very good for positional sound, and that pairing it with that sound card would make them shine, my other option were the Sennheiser pc363D, I already discussed in a different part of this forum whether I should buy a headset or buy an amp for my HD650´s,´they recomended me to go for the 02+odac but i dont want to use them (hd 650's) for my gaming sessions, and that were the ad700x or the senn 363d come in, and why the 290s over the 770s? aren't they going to be about 700$ each? thanks for the reply