Kerso is quite a bit cheaper than that (I have a 2 week old price list here), He doesn't do finance though...They're doing it for £759 and I was thinking of getting it on finance.
If you're happy with the slower speeds of the lenses, but not happy with their performance, take a look at the 15-85 IS. Around £200 cheaper than the 17-55 and every bit as sharp (although not as fast...). That's what we've gone with for our walkabout lens on a 7D.Just want a great all rounder lens
Have a look at: http://www.the-digital-picture.com/Reviews/Canon-EF-S-15-85mm-f-3.5-5.6-IS-USM-Lens-Review.aspx
and: http://www.the-digital-picture.com/Reviews/Canon-EF-S-15-85mm-f-3.5-5.6-IS-USM-Lens-Comparisons.aspx
where you can see comparisons at different apertures and focal lengths.
As to the clicking, that's normally the IS system being recorded. Try it with the IS switched off. The only way around this is to use an external microphone.
If you're happy with the slower speeds of the lenses, but not happy with their performance, take a look at the 15-85 IS. Around £200 cheaper than the 17-55 and every bit as sharp (although not as fast...). That's what we've gone with for our walkabout lens on a 7D.