It's a catch 22 type deal when you say best and then you want all SS and that's a hard to find. I don't think you can find an all SS 9mm for that amount. The new Springer EMP is about $900 and the Kimber is about the same in SS. Kahrs are all $900. Good luck in your search. Wish I could help.
I would search the auctions and visit gun shops, you may stumble on a deal. Somebody posted recently that they got a new Glock for $250 at a shop. Miracles happen.
Else lower your standards. Kahr makes a nice 9mm with polymer frame and s/s or electroless slide. I sold one recently for $450.