Haven't been on the forum for a while and know a few people were interested so thought I'd give a few updates.
Settled on my wheels. I went for these:-
They are stock size (17x7") but 8mm lower offset and a useful 2kg a wheel lighter. I kept the stock tyres as wanted to keep the cars character close to stock (for now).
Picture just after they were fitted below:-
I realise they wont be to most people's taste as due to the design with the spokes not running to the edge of the wheel they look smaller than 17's.