I wouldn't be able to do anything with 16.5GB. Even if I used my computer for what a normal user would. It would barely last me a month.
There is a reason why hard drives are so big now. Applications, and files are more high quality, therefore they require more space.
You should at least limit the SSD to the OS, and get a 500gb HD to go with it. Perhaps after selling the closed loop kit you have there.