Alright mate the wheels make a big difference to the drive. i live in the country side so the roads arent great my car tram lines to a bi*ch. i am often fighting with the steering wheel. you get used to it as i have had low profile tyres on all my cars but as they are so big an wide it a bit worse.
But dont get me wrong i wouldnt change them for the world, when you get on the main roads its fine really quite smooth, an on the motorway its brilliant.
as with the arches theres still plenty of room under there. i have had my car lowered a few inches an i can still full lock on access mode. you can fit 24s with on problems as well.
hope that helped nice car by the way.