What price should i ask for a 2011 Kia Sportage SX.?

I wanted to know what price i should pay for it. Truecar has it listed 28,838 at the lowest possible price for the one with the navigation and the premium package. The dealership wants 34,488 for it. I wanted to wait till summer to get one. The salesperson i am dealing with is very nice and is not pushy whatsoever and knows and accepts that i only want one in orange or red. He has not lead me to a different color or anything like that. I personally don't want to have the dealership get a lot of money off of me but i wan't my salesman to get a good commision due to the fact he treated me so well and with respect. I am only 19 years old and most other dealerships snubbed me just because i was so young. What price would be good to ask?