Re: Wideangle Lens
I have an E-520, the 11-22 and the 9-18...
The camera balances very well with any of the lenses but, obviously, is more comfortable to use with the 9-18.
IQ is similar but I prefer the 11-22, and cannot say exactly why. With time you'l find out it is a very reliable optic, with very little to point out.
Once there was a Four-thirds Sigma 10-20, but is nowhere near as good as the Olympus lenses and isn't cheap either.
You can find very good used Four-thirds wide-angle zooms way bellow 450£. Even bellow 400 Euros in Germany.