you do understand that trek has a website that will answer this question.

the difference between the performance and pro edition is the length of the head tube, performance has 30 more mm in length, which gives less saddle to handlebar drop. this is a big difference. otherwise, the frames are the same and aside from a slightly more sloping top tube on the performance line (due to having a longer head tube), geometries are the same.

you should be discussing your fit with the lbs to determine which suits you best instead of worrying about the color scheme.

I got a 5.2 in June of this year, it's a great frame that i've raced the shet out of over the past 2 months. I got it to replace a cervelo R3 that I broke in a crash and it's every bit the equal to the cervelo performance wise, although the cervelo is a wee bit more plush.

the price you're stating is very good.