Artic MX4 is a better thermal paste. You don't need time for it to settle in. There are already games using more than 2GB of VRAM. At the res you will be playing, makes even more sense to get 3GB or more for the video cards. Plus, with next gen console, more games will definitley be using greater than 2GB.
Also, SSD is more then just boot and load times. Using it just for the OS, your computer will feel much more responsive and snappy. For example, clicking your web browser will open instantly, due to ~0 seek time vs 12ms. Spending that much money and not getting one should be a crime.