The GTX 760m is a good graphics chip for a laptop. It is a lot weaker than the desktop version of the GTX 760, but as you said, you do not have room for a desktop.
16GB of RAM does not provide better performance than 8GB of RAM. So if you can drop that down to 8GB you can save a little bit of money. Of course, if you need that 16GB of RAM for other things then that's different.