First things first, you've got to try the Sheboygan Brats when you visit AT&T park, they're amazing. Beers will run you close to $10 but it's San Francisco after all and you have to have at least one. You can bring your own food into the ballpark which is something I love.
The only seats I would recommend staying away from in this section are rows 16 thru 18 because the wind and breezes are cold and strong. The lettered rows in 326 are the rows you want beginning with row A.
You're going to love this ballpark.