Tires are a personal thing. I've got continentals Contisport contact (not 2's) on my C230K . They are hard, relatively noisy but mine last and last for ages and ages. I got 45,000 miles before the garage told me they needed changing. I am obviously not a 'Graham C230K' type driver! Purely from the economy, they're okay. A new set last year cost me £520 all in on 17" amg alloys staggered setup 225/45/17 and 245/40/17 if I remember correctly. This works out at £12 per 1,000 miles.
Les