Want a pair of shimano rs80's with a couple hundred miles on the clock? I've got a pair of ksyrium sl's I've sunk too much money in to to not use so they will be spare very soon.
RS80 > Ksyrium SL
Just saying.
To the OP; RS80s are probably the best wheel in your price bracket, but also don't do anything worthwhile that RS30s (or Mavic Aksiums) don't do for £250 less. The RS80-C50 or Mavic Cosmic Carbone are probably the cheapest road wheels worth upgrading to from the above cheap wheels, and both are above your target price unless you find a particularly good deal on the Shimanos
RS80 > Ksyrium SL
Just saying.
To the OP; RS80s are probably the best wheel in your price bracket, but also don't do anything worthwhile that RS30s (or Mavic Aksiums) don't do for £250 less. The RS80-C50 or Mavic Cosmic Carbone are probably the cheapest road wheels worth upgrading to from the above cheap wheels, and both are above your target price unless you find a particularly good deal on the Shimanos