I can't help you with tire advice but if you are a GT owner, please send me a PM with your serial # and car color so we can change your status to "GT Owner". Thanks.
Willem, there is a sticky here about wheels and tires with many suggestions, including brands and sizes.
Personally, I think the Michelins are the way to go for all around great tire. You might look for Kirby Viera's posts on his Michelins.