.. wondering whats the best site to play with this balance.. or do i just need to add more to it just to be safe?
There is no best sites for this purpose because gambling is gambling, no matter where you play then luck will be only the key to help you. Just make sure that you are going to play in a provably fair gambling site and trusted one and let your luck decide what is the best for you.
Add more balance wont give you more safety, just play with the money that you can afford to lose (as mentioned/suggested many times already). Dont force yourself bet more than what you can afford to lose.
Due to the house edge on every casino, you're never going to win in the long run (which is something you should already know). If you enjoy gambling, set aside a certain amount of money every week or month to gamble as a control mechanism. If you want to make money, investing in a casino can be profitable, but not always. Lending to an exchange may also be a good idea.