I'm getting fed up with the 18" wheels too. I thought they were OK at first, but due to a combination of lumpier roads and me getting older every day, I'm thinking about 17s now.
I might have a hunt next time it's due for tyres. I should be able to swap front and back round as required so it wears them all to the limit, while keeping an eye out for something similar to this deal.
That will be at least a year away though - the tyres are pretty new at the moment, and I don't feel strongly enough about it to bin them.