Cheers for the comments so far, I am not a fan of proprietary wheelsets full stop so will be giving the Ksyriums with their fancy spokes a miss.
The question of custom wheels has been on my mind as I really like the look of the Velocity A23's or the C-4 V22's and have been thinking of building a set up anyway in 24f,28r or 24f,32r depending on what hubs I use as I enjoy building wheels myself.
Looking at it from a financial perspective I can probably sell the Rapides for a decent sum, then buy the rims and hubs and do the build myself with a bit of pocket money left to go towards a Garmin 800!