Koss Pro DJ 100 easily. They're very neutral, so it just depends on what sound signature you like.
The SR-80 sounds a bit similar, except for the highs. The Koss has a lot more bass then the SR-80 though. I could definitely suggest the SR-80, but you can do better for the price.
To me, the Pro DJ 100 sounds like an improved version of the SR-80. Vocals, soundstage, Instrument Separation, bass and comfort is a lot better.
The bass amount is about the same as the SRH-840. I think it's not a bass light headphone at all. I set my EQ to a 2db increase and it's almost too much.
If you like bass, check into the M50 maybe. I prefer the Koss over the M50 any day, but it's maybe because of the type of music I like and how I like something more neutral.
The vocals on the DJ 100 are just as good as those on the SRH-840. I think both headphone have a slight bump in the mid-range though. Maybe not as much as on the SRH-840 though.
I guess they almost remind me of the MDR-V6 a bit also, but with far better mids.