I'm going to have to agree with other users and recommend Sennheiser HD 598's.
I wouldn't necessarily call them "bright", but they are accurate without being boring. They are by no means a bass monster, but they extend well and the sub-bass doesn't feel restricted. The bass that is there feels very tight and controlled.
I ordered the AKG Q701 at the same time as my 598's and sent the 701's back. While they felt flat and true-to-life, they were very low in energy. The 598's were more of a pleasure to use.
However, if you're looking for the most accurate, flat headphone that won't sugar coat a thing and offers zero help in the bass department, I believe the AKG Q701 is your best bet and they can be had for $199.99 on Amazon right now.
On a side note, the Q701 is very comfortable and has a soundstage that seems to go on forever; by far the largest I've ever heard.