[Lardyfella]

I am looking into new tires at the moment and contemplating the Avons but i have to import them from UK to Dubai on top of the cost of the tires as they are not available here and i want to ensure they are the correct choice before i take the plunge. I have the Firehawks on at the moment and they are hard as rock and old also.
They are 255/60 R 15 on the front and 275/60R15 on the rear at the moment.

Avons have 225/65R15, 245/60R15 Or 245/60R15, 275/55R15 as the options which ones does everyone thinks the better sizes to opt for? ( I think option 2)
I am using the car on the road 90% and 10% track and its a 427 Superformance MKIII.