I also have most of my sector holdings in UMN and UUU purely on the basis that both are likely to be big risers in the next few months with production not too far away with UMN and a major increase in both stated resources and production coming up with UUU.
I sold two of my more speculative uranium stocks (TSX:BAY&CHX) recently in order to top up in UMN and UUU as I saw short term gains, with lower risk, looming large. My other speculation (ASX:UNX) has doubled in a very short time and I will be looking to increase my exposure to this sector in the near future with URA very much in the frame. I'm coming round to the idea that companies with African assets are going to do very well. With the dollar likely to perform badly and Canadian dollar (surpisingly in my view) performing badly it may be better to look for dual listings here or Aussie stocks for one's ISA. The sooner URA list on the ASX the better!