Howdy,y'all I'm a newbie on the form and hopefully I will soon be the proud owner of a new 2006 Kia Rio owner

I really love that little car I drove it today and I was really amazed with its power and features for the price! The dealership is going to see how much,they can get me one for that is fully loaded with everything, the LX package,spoiler ,abs the works!
I built my own 2006 Kia Rio Sedan on the Kia.com website and says its $15, 155 is the MSP. But I know the dealership has to add all that other stuff tax, dealer markup etc. My question, is what would a good price be? Anyone with a Rio Sedan, what did you pay for it with everything? Also, the car will be an automatic. The dealership seems to be pretty much on the level,and told me they would beat the price of the another kia dealership. The dealership has to find a Rio like I want with everything and then,they will give me there lowest price,tag, tax etc. How much more over that $15,155 do y'all think they will ask? I don't wanna get ripped off and pay too much, for my car.
Any sugguestions on how I could get a lower price, or just any advice would be great!
Also, they are offering free oil changes for the life of the vehicle? Is this something every Kia does,or is this just something special that this dealership is doing?
Thanks,
WNCKIA