There are a number of over-ear headphones that aren't too bulky at all. Depending on the size of your ears, headphones like the Audio Technica ES7, ES10, ESW9, etc., are all over-ear and are light and small. I've got a small comparison of the ES10 and the ESW11LTD
up here.
BTW: I'm a big headphone geek. I review for magazines here in Japan and get to meet producers of some of the finest headphones around. None of those headphones come from the likes of Bose or Beats.
But I very much doubt the OP is going to go for audiophile brands when s/he is asking about Beats first.
OP: the Beats are fine enough headphones for what they do and are not too bulky. If you have small ears, they can even be over-ear headphones. Sound-quality wise, you should stay away from the likes of Bose and Beats for your dollar value. They work well enough, but their sound quality compares unfavourably against a good Sennheiser. The quoted HD25 is an amazing headphone.
The new momentum even better: thicker sound more friendly to Beats and Bose users, great comfort, even better build quality.
If you want refinement, check out the expensive, but lovely Audio Technica ES10. It can be had for sub-500$ in the USA, which is a great price. The ES7 can be had for about 100-150$ and will smack the Beats and Bose around for sound quality and construction. It looks very nice, too.
In case you wondered, Sennheiser, AKG, Beyerdynamic, Audio Technica, Grado, Ultrasone, and a very few others are serious headphone manufacturers, making the world's most trusted headphones, used by professionals and music lovers (audiophiles).
Beats and Bose and Ludacris, etc., are consumer brands that look cool, but cost more because of celebrity endorsement. They do not perform up to their price points, and often include deleterious sound circuitry such as noise cancelling functionality.
If you want actual sound quality, go with real headphone brands. If you want to fit in with popular culture, go with Beats and Bose. If you live in a place where headphones are liable to be stolen, stay away from popular culture and go for real headphone brands that regular thieves have no idea about.
By the way, the DT1350 is a great headphone, but it is on-ear. If you wear glasses, it is rather uncomfortable, but the sound is very good. In fact, I'm probably selling my pair as I tend to use earphones for portable use and at home I stick with my DT880 600Ω.