Here is my take, spend most of your money on the speakers, since they last forever and don't really go out of date, unlike any electronics.
15K is not really a huge number, I spent 10 on mine, and that is just the sound system +sources, no display! 7K was on the speakers.
Remember, put most of the cash into things that don't really go out of fashion. Go separate to mitigate upgrade cost. A good amp will last you a lifetime. Or the lifetime of the capacitors on board
Another thing, don't forget the material you are gonna play, that cost a lot more money than hardware.
http://photobucket.com/albums/b142/sdifox/HT/?action=view&slideshow=true