I started this thread almost a year ago

But I am pleased to say I have finally got the car lowered.
Went for the 20mm Eibachs in the end as I really didn't want to mess up the ride quality.
Here's a before:
And the after (also with the 17" wheels)
Ride is pretty much the same - maybe a tiny bit firmer, and a little better in the corners.
I'm really pleased with them, didn't really want the car to look like it was lowered, but didn't like it being on stilts either. So I think the Eibachs are a great choice for improving the looks without makeing the ride harsh.