Welcome to the forum!
If you are really concerned about comparing prices it's something better done before you purchase.
However, for the X MSRP is standard for the majority of dealers it would appear.
Dealerships differ in what they charge for accessories especially installation.
You don't say what trim package you have, but it sounds like it might be touring with Navigation?
Tell us more, color, etc. Got pictures?
Just found this site tonight and it is ironic because I just took delivery on a 2003 MDX it is Nighthawk Black Pearl with the Ebony interior. Touring package with Navigation and DVD Player. I am adding running boards, wood dash, tailgate deflector, moonroof visor and cargo cover.
I had been looking for over a month and dealt with many shady dealers until I found Valencia Acura and the Fleming family. Told Brian Fleming what I was looking for and what had happened at other dealer (i.e., $1,000 deposit for a car that somehow never would be what I had ordered). He was completely honest and called me 1 week after to tell me he had the black on black I was looking for as someone had fallen through. Good thing for me from what I am hearing here.
Don't worry about how much you paid or overpaid. X is priceless in my opinion. I swear, I have never driven a finer vehicle in my entire life. The first time I drove my new X, I had tears in my eyes. I totally love it!