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I know we all have our own ideas of what looks good, but surely, at the price point you are looking at, getting the best spec you can for the money should come higher on the list of concerns than how the graphics look. I wouldn't want to ride a bike that I absolutely hated the look of, but there are a lot of bikes out there for around £500 that represent killer deals that will unfortunately, from your point of view, have very eye catching colour schemes and graphics. I suppose manufacturers tend to do this to make their cheaper models look more like their top end bikes and hence make them more desirable in a very competitive market.
I bought a Felt F95 from Merlin Cycles last year, which had a RRP of £599.00. I got it for £365.00 + £7.00 carriage. It weighs in at a respectable 9.8kg and is pretty well specced. It's a fantastic bike to ride. It also scores very well in all the reviews I have read of bikes in the entry level category. The graphics are pretty "noticeable" but not ridiculous (I got the black and green 2014 model). The graphics on the white model are still fairly bold, but perhaps a little less noticeable than mine.
If you're only looking at spending a certain amount on a bike, especially if it is at entry level, I'd go for something with the best frame and components possible, as these are the things that will make a real difference to the way it actually rides (and your potential enjoyment of it) rather than the colour scheme and graphics.
