Personally, if you have the budget, I would go for something a bit better (Corsair CX***M Or one of the Seasonic ranges. (have a look at the PSU tier list) But as far as power goes, you would be fine with 550W as the system is.
Yes i want to change it with something better i just wanted to know if its ok with the 550w for now so if it is ok then not to worry, so thanks for your answer. Be good