Highly recommend Tokina 12-24mm lens
Sharpest lens ive ever bought
They sell on here for around the 250 quid mark
I've recently bought a second hand Tokina 11-16mm in a Nikon fit and I really couldn't recommend it highly enough. I think I paid £180 for mine on here.
Also the Sigma EX build is very impressive, OK not in L league, but still much better than typical for non OEM equipment.
Also there are two versions of the sigma, one slightly faster for chunk more money - don't think it's worth the extra
The Tokina's beat the Canon hands down!
I got the Sigma 10-20 for Christmas, and I think it's great, I couldn't believe how much you can fit in the frame at the wide end. I love it!

Oh no it doesnt! Canon 10-22 is the best UWA for Canon APS-C mounts by far, its practically L glass (and apparently the only reasons its not marketed as L glass is the fact its an EFS mount!). Its at a price though, which is out of the OP's budget.
All 3, Sigma, Canon and Tokina are brilliant though!
BUT the Tokina 11-16mm is better than the Canon sharpness and speed wise (f2.8)I got the Sigma 10-20 for Christmas, and I think it's great, I couldn't believe how much you can fit in the frame at the wide end. I love it!
Santa must have had a Job lot of them 
Not trying to disagree with you today in everything you say, I really am notBUT the Tokina 11-16mm is better than the Canon sharpness and speed wise (f2.8)
I will agree with you (you see) in that it loses in versatility as it covers a much shorter range.
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I don't know if the 10-22 is the best but it is very good. It made all my other lenses look rubbish until I got the 17-55 and 70-200 f4L IS. Now it's the weakest.Oh no it doesnt! Canon 10-22 is the best UWA for Canon APS-C mounts by far, its practically L glass (and apparently the only reasons its not marketed as L glass is the fact its an EFS mount!). Its at a price though, which is out of the OP's budget.
I don't know if the 10-22 is the best but it is very good. It made all my other lenses look rubbish until I got the 17-55 and 70-200 f4L IS. Now it's the weakest.
Oh, I don't know, by looking at the pictures I get from the lenses and comparing the IQ, perhaps. The 17-55 has better IQ than the 10-22. That is not a criticism of the 10-22 it's just a fact. At overlapping focal lengths the 17-55 is better.
Of course in the 10-17 range the 10-22 wins hands down...
I've recently bought a second hand Tokina 11-16mm in a Nikon fit and I really couldn't recommend it highly enough. I think I paid £180 for mine on here.