I don't plan on selling the Mojo, but I'm always interested in a trade for something better. I plan on selling everything else though, although I've had some people tell me the Groove is better. I just got the Groove and haven't really used it yet. The one thing I stillneed for the 660S is a good desktop amp to give it a ton of power. I listen to a lot of hip hop and synthwave, so the one down side to the Mojo for me is that it doesn't provide enough bass power to make my 6XX [and soon 660S] exciting for those genres. I've seen some comprehensive reviews that say the Schiit Jot amp is incredible for the 650, but I've never tried it and I don't wanna waste the $50 restocking fee if it's not going to give me the bass slam I want. My main objective at this meet will be to find the right amp for my 660S.