Well I actually prefer sidewall height no less than 10cm but for the Mark X I also bought the tires used together with the rims so cannot be too choosy as well!

Ideally I would like 235/45 & 265/40/18 but those sizes are not as common especially 265/40/18 so that will be damn expensive too, and not sure if can still clear or will rub the rear fenders already. So second choice would be 225/45 & 255/40/18. We'll see later when comes time to change again (and that's also assuming I still own the car too).
Continental tires are good, at least based on my previous experience on CSC series but not their low end (well IMHO all low end models are hopeless anyway no matter what brands!).