Don't bother with those Sony's. Absolute garbage. The Bose are laughably over priced, and are a muddled mess to my ears, but do offer decent noise reduction for people who are on a plane a LOT. Though, there are cans with similar noise reduction features for less money and sound just as good.
I'm not too sure if I've heard those particular Beats cans, but if they're anything like ANY of the other models, they're simply bass heavy and don't offer any kind of sound stage or detail. There are tons of options out there.. so don't be hasty. Check out
Head-Fi.org - Headphone forums and reviews for audiophiles if you want very detailed reviews of headphones and such.
I have a pair of Ultimate Ears UE 5's, various pairs of other in ear monitors including Altec Lansing, who outsources UE's models and sells model like the UE 3's a lot cheaper, they just aren't called UE's. Also have had Etymotic, and Shure variations. My favorite Pair which run about $500 were the Shure 515's which are now discontinued, but replaced with the SE 535's. They're a bit more analytical and have more punch than the UE 5's.. But the UE's were a bit more forgiving and don't care what kind of music you throw at them.
Again, there are TONS of headphones and cans out there.. too many for me to go over, that's why I listed that site. I've also had Sony V6's which are great.. they're studio monitors as well, and the only pair of Sony's I'd recommend for music. I've also had Grado SR80's which are very musical, but they don't isolate at all, and can be annoying to people around you. I've had several pairs of Sennheiser's, HD 555's 580's... each great, but require a good source and amp, not really your typical iPod headphone.
I've also had a couple pair of Koss SR35's, Porta Pro's and Sporta Pros... The Porta Pros are EXCELLENT. They're legend, actually. Thin light over the head frame, like old fashioned headphones used to be. You know, like how they used to be with Sony walkmen. I've also had many a pair of JVC Marshmallow in ear ones which cost about $15 and they're pretty ****ed good for that price. Better than said Bose and Sony for sure. I know... you probably think that kills my credibility, but never knock something you haven't tried. Those little things can be modded to sound really good.
Doug