I currently have some Klipsch Custom 1s but I need some new ear gels, I have just been on the Klipsch site and they want £10 per pair

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I have also today received a £25 off a £50 spend code from Littlewoods and using this I would be able to pick up a pair of Shure se102s for a little over £30.
There are also a number of Sennheiser headphones available at Play.com for not much more than the cost of some new Klipsch gels.
Therefore my questions are
1) How do my Klipsch headphones compare to the Shure se102s and various Sennheisers upto the value of £30odd
2) With the answer to question 1 in mind would you a) Buy the Klipsch gels or b) Buy either the Shures or Sennheisers?
Cheers