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I've got 50/34 12-28, it was fine at first but over the summer I've got fitter and even riding the biggest hills in the peak I don't need 34x27 any more and I run out of gears down hills too. jumping up to 53/39 might be a bit much though.

i know a lot of people who grab about 52t or 53t and than i don't see them using the full cassette. My road bike has a 50t/34t with 11-25 and to be honest i think it's great for 99% of the rides.
Try to set the bike a cassette with a 11t and you'll see that you don't need many changes.
If you feel that you run out of gears with 50/11 man, than you're ridding hard ;)