We're always on the lookout for good values in the headphone category and the Shure SRH145m+, which sells in the US for $49 online, is among the better ones, offering very good sound quality for the money. (The headphones will be sold in the UK and Australia but prices are not yet available; the US price converts to about £30 or AU$55, but expect final prices to vary.)
Before I tell you more about that sound, I should clarify that the m+ version of the headphone has an integrated Apple friendly inline remote and microphone (not all features will work with Android and Windows phones, but you can make calls). The standard SRH145 has no remote and costs a little less.
Meanwhile, the SRH144 has has a semi-open back design that allows more sound in from the outside world. All three models sound virtually the same.
Generic but sturdy design
I can't say I was blown away by the design of these Shures, but it's better than that of many sub-$50 headphones. They look pretty good from afar. Up close, however, they don't fool you into thinking they're a more expensive headphone. They're rather generic and made mostly of plastic, though they do seem sturdily built and the cable's heavy-duty 3.5mm plug housing should withstand a fair amount of abuse without failing. The 5-foot (1.5-meter) cable is non-detachable and impedance is rated at 34 ohms.
On the headband there's a faux-metallic finish that looks attractive enough, but that finish is prone to showing scratches and dings, so you may want to be careful where you place these headphones when they're not in use, especially since so protective pouch is included (avoid mixing them with a set of keys in your bag).