Get the GR, you'll never ever regret the purchase.
I've a Kp which is smaller than K-3 plus both 15mm ltd and 20-40 ltd; a friend of mine borrowed his GR ii for testing it over a weekend.
The handling and inconspicuousness of the GR plays on another different level, is a street photo monster and the best purpose-designed camera I've ever tested. One handed operation is where it shines, a dsrl or milc can't even come close.
People don't notice you or don't bother because they think you're shooting an old Sony cybershot/Nikon coolpix kind of camera. Try that with a dslr.....
The image quality is amazing, the lens sharpness is phenomenal! A sample of the quick pics I did (jpg stooc, didn't mess with my friend's settings)
Living as you do in NY, it would be a no brainer for me. I'm planning to visit your city in june and buying the GR is the first thing on my list.