I'm looking for advice on a mid-level set of over-the-ear closed back headphones. These will be used at work in a cubicle environment, thus the need for closed back style. I have a set of Sennheiser HD6xx that should show up in December, but those really won't be OK in the office. My budget is...

I want to get some friendly advice on where to go. I currently have a pair of Audio Technica ATH-A700 and am waiting on a pair of Sennheiser HD 6xx that I should get around Christmas. I also currently have an Objective 2 and ODAC that I'm primarily going to use as a portable combo for travel...