Couple of UK internet sites that are worth looking at. The one I do prefer for wheels though is Merlins.
http://www.merlincycles.com/bike-sho...y-road-wheels/
Wheels are the best improvement for a bike you can get and plenty that are better than the OM sets supplied and can be found at a sensible price occasionally. But if you are happy with the Aksium wheels--Proven solid wheels- why not just changes the wheelset over?