tbh, that's the sort of question that would get a more knowledgeable answer on the 190 forum.
Lots of their cars on there have 16 x 8 alloys so they would be the guys to ask.
I just searched on google and went with a local place with reasonable prices. Firstly, I got a couple of Infinity branded tyres (through Camskil or Blackcircles) with little knowledge of them. I liked them and so next time I needed two more I got Infinity again. Can't remember what I paid, £60 ish per tyre maybe? This was all more than a year ago (still using them though).