The other ‘negative’ of XC wheels is counterintuitively, weight!
Road rims weigh ~450g or therrabouts. There are lighter and more fragile rims, and heavier touring rims. But on the whole the average rim is about 450g.
An average XC rim is 380-400g. Despite the pounding they take off road, thats offset by having 2.3″ of squish taking out all but the biggest of impacts.
For £330 or thereabouts though you could probably get either a set of hope factory built wheels, or have a go at building your own.
Hubs -£180
Dt r460 rims and dt comp spokes from rose/bike-discount.de depending whos cheapest at the moment £80.
Total = £260, leaving £70 for a jig and use the free how-to on the sheldon brown site (or just get someone else to do it).