I've auditioned most, if not all, of what the source av has in that price range. The main ones I would try are the aeons (particularly the open ones, which imo are a bit muddy with the default tuning pads). The hd660s is also pretty relaxed. LCD-2C is supposedly more comfortable with the suspension headband. Cheaper in the spectrum, there's the pm-3. And though it's been a long time since I heard them, I recall the meze 99s as being fairly dark. You can look at measurements on innerfidelity or diyaudioheaven to find others, I'm sure.