I've had a couple of pairs of Skullcandy's now, and they broke within a month. I didn't rag them about, they broke at the jack point...can only assume when they were in my pocket the continuous movement broke the connection.
I have however had a pair of Sennheiser CX-300 IIs for going over 3 months now and the wire is better made, as is the jack...as it goes in an L shape but the wire leaving it is quite loose so it can freely move. It obviously works better than the Skullcandys and they sound much better through all the ranges too. They aren't as bassy but you can hear more ranges through the bass, so good compremise in my opinion.
I'd go for the Sennheiser CX-500s as linked for £15, they should be around £50. I got my CX-300s from play.com for £17, in HMV they were £40, bargain.