Yes, you can easily disable the hibernation file. It's not issue if you never use hibernation.
Also: another thing I can think of is that Windows (if allowed to manage the size of your page file) will usually set the maximum size of the page file to the same amount of RAM that you have. So in other words, if you get 8GB of RAM, you will lose up to around another 4GB of space on your SSD. This can, of course, be changed if you manually set up the parameters of the page file.
Someone correct me if I'm wrong. I may have the facts mixed up.