I went for 185 55 in the end, which is stock. Saved me a bit of money as I only needed 2. I'll probably never lower the car so not much point going for a much lower profile. The 185 55s still look quite good.
To look up tyre presures I checked the car manual and actually found they list what tyres are needed and they state 185 55 for 6J and 195 50 for 6.5J, and mine are 6J so I'm happy with that.
Cheers all. Off in a bit to get wheel alignment sorted.
