Even though they are amazing and improve your experience by a lot, an SSD isn't required, so thats 120$ there.
I wouldn't bother with 16 GB RAM unless you are going to do video editing, audio work or 3D modelling. So that's another $50 off.
I was going to say with the saved $50 from ram I'd upgrade your videocard to a
660 OC because it gets far better performance (about 70%-80% better performance for only a 33% cost increase).