It is getting rather dated and might be good to replace it. However, it is technically sufficient for the config you described. The Corsair you mentioned is okay as well.
What is your replacement PSU budget? There may be better options for you.
I dont really care.. I just need a new GPU because the last time I played Steel Division Normandy 44 my PC shut downed completely but before that my GPU almost burned down.. So GPU and PSU replacement seems valid
btw are there any things that I should be cautious about when installing new GPU ? I wont be reinstalling windows so I can use some help regarding uinstalling old drivers and all that stuff..