Hello there. I am looking for a nice pair of headphones that have little to no leakage that have good SQ. Anything with a punchy or attacking bass is preferred, as I listen to mostly House, Techno, Dubstep, D&B, etc. (bassy music). I want them to be over or on-ear, it doesn't matter as long as the driver isn't above 50mm (shouldn't be a problem). I don't care about driving or "amping" them as I only listen to music from my iPhone. Style is a small factor, but not huge, as I would use these for mostly travel. That being said, noise cancellation would be convenient but not entirely necessary. I am currently looking at ATH-M50's, V-Moda's or maybe Bose QC-15's to give you an idea of my price range (150-300 USD). Again: main factors are portability and LEAKAGE.Any suggestions? Thanks for your time, everyone. 

I don't know how well the m50s compare to the other headphones you're looking at, but I can tell you that they do isolate a fair amount of noise. Not quite as well as my HD 280s, but IMO it's still enough for portable use. They also feel very durable and I'd have no problem bringing them out of the house. If you're a major bass head I don't know if these will have enough for you, but their bass impact is much harder hitting than my KRK 8400s, which are considered to be "neutral" headphones. 

The Philips Citiscape Uptown headphones might be good. I listen to every genre and I think they are great for everything. I did a leak test with my friend, and we found them to be one of the least leaky headphones available.

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rezound sound said:

The Philips Citiscape Uptown headphones might be good. I listen to every genre and I think they are great for everything. I did a leak test with my friend, and we found them to be one of the least leaky headphones available.

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This sounds the most promising. Pretty sure I'll go with these. Hello, Christmas present!

HD-25 I II should be enough.