I'm interested in buying my first "nice" watch. I'm considering purchasing a Tag Heuer Link chronograph with a black face. I would prefer a larger face to compliment my larger wrist.

I have a couple of question for the resident watch experts on this website:

1. Is there a particular model I should look into? I've been reviewing model ct5115.ba0550, however, I've also notice a couple of watches endorsed by Ayrton Senna.
2. Although I've read all the articles on this site about white vs. gray market watches, I'm still confused as to the benefits of the authorized Tag dealers. Any input would be appreciated.
3. If I do go with an authorized dealer, what percentage discount should I be satified with (20%, more?)?

Any other thoughts would be appreciated. Thanks.