I am currently looking for on-ear headphones that are fairly balanced but pack a good punch in the bass department for movies, games and tad of music (a lot of Rock/Metal with a good measure of electronic mixed in). Sound-wise I am very happy with my Beyerdynamic DT770 Pro 80 Ohm, so they can be used as a rough reference.
I would like to specifically have on-ear headphones (or other non-over-ear types of similar quality) because I spend long amounts of time at once with headphones and would like to minimise skin contact. I am prone to sweating during those long consecutive sessions - especially in the summer months - which isn't very beneficial for both the earpads as well as my skin.
Having looked around a bit, it seems that the Sennheiser HD25-1 II wouldn't be too bad of a choice but I am open for your expert suggestions!