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Sony MDR-EX650 Or Beyerdynamic DTX 101 iE - should be had for between £50 and £60
if you like sennheiser, try the new Momentum M2 in-ears. Bit more pricey though at £90
All depends on cable joins and strength though - if you habitually yank the things out of a bag or pocket the cables will go an anything regardless of cost.
I won't mention that the Hifiman RE600's are now half price, a total bargain at $199 now...
I love Sennheiser CX300 but with my usage they get rekt more frequently; anything that has similar audio quality but tougher out there? Dont mind paying a little extra.