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hey Mike
I have the Canon 10-22mm and recommend it but I don't actually use it myself all that much these days (all my 20D gear is loaned to a friend at the moment).
A couple of people on my workshops had the Tokina lens and it looks like an attractive f2.8 option for the APS-C cameras (under $700 as far as i can see).
For timelapse you can get away with much lower image quality than for a sharp widefield still image. In fact a bit of star bloating helps make the bright stars more visible as they can otherwise get lost. My 24mm f1.4 is pretty ugly in the corners wide open (it is f1.4!) but in the videos you don't really care.
Phil
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