I too ride a Trek 7500 and quickly grew to dislike the stock handlebars. I was lucky when I took the bike in for it's 100 mile tightening because my LBS had just sold a 7500fx to someone who did not like the Bontrager Crowbar that came stock on the bike. They swapped my "big" riser for the Crowbar (at no cost!). With a few adjustment to the height and angle, I am very pleased with the flatter bar (still has a slight (25mm I believe) rise and 5 degree sweep) and was able to keep all the existing componets.

You may want to check with the shop where you purchased the bike to see if they can do the same for you.