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Actually been discussing this with a friend today and we came to the same conclusion. I'm really shit at setting up gearing stuff so I think I'm going to take it to a bike shop and have them set it up properly and then go from there.
If I do want to change things up, first thing would be the wheels.
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Just in case you do decide on a new set of 'cheap' wheels - look at campagnolo sciroccos before you buy a set of aksiums - I was extremely impressed with the weight and rigidity of mine, since they are a slightly deeper than usual alloy wheel and 35mm, I ran mine all autumn and winter and they still run silky smooth as if they're new!
Before spending money on it I'd fix it up as best you can for free. True the wheels and fix the shifting first. Some new cables and bar tape would also go a long way without spending loads of money on new wheels and a groupset