Farnorthsurfer - As I said above, I've got the Michelin Cross Climates on an Audi 4WD and they're great but so they should be at £250 a corner for the Audi 20" wheels that I have!
Good shout on not using 4 seasons on the front only - never thought of that.
Any other views / recommendations appreciated.
Tyre wise you want to avoid anything that will promote oversteer. Thats why even if replacing just 2 tyres like for like the new ones (with the best grip) should go on the rear.