10 - 20mm is awefully wide on a full frame camera Mike. Remember how wide the 10-22mm Canon is on the crop body, to get the same you only need a 16mm.
Canon has the 16 - 35mm f/2.8 zoom and the 17 - 40mm f/4 zoom. Out of those I'd go for the 17 - 40mm.
If you want W-I-D-E then there's the EF 14mm L, but it's very spendy.
Cheers,
Jason.
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