Lens choice help please

Hi all in DSLRland:
Heading over to NZ next week for 5 weeks of work (plus a little sightseeing as I go). I need a wide angle lens (I have a Canon 30D) and have narrowed the choice down to either the Canon 10-22mm or the Canon 17-40mm L. Both are approx the same price, the 10-22 is EFS and the 17-40 is EF.
Some advice on which would be the better purchase will be much appreciated.
With thanks,
Ozi.
Heading over to NZ next week for 5 weeks of work (plus a little sightseeing as I go). I need a wide angle lens (I have a Canon 30D) and have narrowed the choice down to either the Canon 10-22mm or the Canon 17-40mm L. Both are approx the same price, the 10-22 is EFS and the 17-40 is EF.
Some advice on which would be the better purchase will be much appreciated.
With thanks,
Ozi.