If you're serious about a Leon eliminate the ST170 from the list straight away! Long story short we were getting one transferred between dealers within a group, through a series of fuck ups(like losing it, then finding it round the back before transferring it to being told it wasn't for sale and was being moved - for us FFS!) it got sold over a weekend, then we found the ST170 we've got with lower miles and one owner. We test drove a Cupra R before though and while it didn't feel as lively on a back road it definitely got down the road better, unfortunately it was about 2k out of our budget, all the other Cupra's were too high mileage, too old, wrong colour etc..

My choice would be a very tidy leon, remap and subtle drop, given your shortlist. Personally i think the leon has aged better against the focus.