wheel upgrade

I am considering upgrading wheels early spring.I have a 2009 Defy 1 which has mavic cx 22 wheels, with gatorskins.I don't race but do ride for fitness including commuting and longer weekend rides when possible.Would it be worth spending a little extra or would it be worthwhile getting something around £150. Several recent posts seem to suggest decent wheelsets around this price, but I would appreciate advice. Thanks in advance.
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How about getting some good fast tyres to put on as a treat for non-commuting rides when it's nice weather, like Vittoria Open Pave with some Latex tubes?
ABCC Cycling Coach
However I used them for a month and found them so flexy. Depends on your weight, I'm about 80kg.