Share 'One or Two pairs of wheels?'

Last season I ran a pair of Mavic Open Pro/Dura-Ace wheels with Stan's and Vittoria XG tyres. I have just splashed out on some new wheels and bought some Mavic Ksyrium SL Premium's (I also have a pair of these on my road bike) and will use the Open Pro/DA for training. I am going to run these again with Stan's but with the new XM tyres, as I feel with more grip I could ride with more confidence.…