How much do you want to spend?
The Canon 10x22 is a superb lens, I use mine for landscape and love the results - I have 'used' a Sigma 10x20 and it was good but prefer the Canon.
But these are both defined wide angle and you state the 55mm end of your 18x55 suits your needs so the 24x105 is a BIG compromise on what you are seeking in that at 24 mm the crop factor will be of no benefit to your desire to 'go wider'
Whilst the Canon 10x22 is not an L lens - the outcome is very close to L quality
I recommend it.....................
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~John~
"It ain't what you say - it's how you say it!"
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