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Shimano 105 is a seriously good groupset for the money and you can usually get a second hand 105 specced carbon/half carbon bike for around the £700 mark.
Campag and SRAM will cost you more and the benefit of either is negligible until you get to Record or Red.
Groupsets aside, the best and most noticable improvement to a bike is always your contact points; bars, stem, saddle (for riding position) and then wheels and tyres.