Catriona - the XT hubs are actually what I was looking at using; I found some rims by Velocity that look promising, they are called a Dyad and they come in 32/36/40 and 48 hole patterns. They are 24 mm wide which I think is what my wheels are. Not sure which hole pattern would be best really. I'm just getting started here so I think I have more questions than answers at this point I have noticed that spokes come in different diameters too?