Hey, I can actually make a solid recommendation! This must be my lucky week for posting here.

I've got a pair of AKG K240 mkII's I love very much. I got them at a good deal on Amazon when I ordered the old version and they sent me the new version either by accident or through trying to phase out the old version. In short, they sound fantastic. They're pretty flat in terms of frequency response, but being over-ear they still have pretty deep-sounding bass. I've found them really nice for recording and mixing.

The only downside I can think of is they can get pretty uncomfortable over long periods of time, but this is definitely a personal thing, as I have pretty weird-shaped ears that have bits of flesh sticking out everywhere.

If you can't afford the the $110ish pricetag (I couldn't when I got them), it appears Amazon still sells the original version for around $70. They are (according to what I've read) almost exactly the same headphones in terms of drivers/construction, just with less padding and fewer accessories (the mkII's come with a second replaceable cable, a different set of ear pads, and an 1/8" to 1/4" adapter). I have no doubt these would also be an excellent investment if they in fact are the same headphones as the ones I own. Here are the originals.

Hope this helps!

Depends where you're at as to the options you may have available, but in the US market for example, the Fidelio L2 is another great option. There's also the Takstar Pro82 for a closed-back. And the AKG K240 / mk.II is also an option.