Firstly, if you know your current PSU is not working well, STOP using it now. It could wreck the other components if it really goes wrong. YOu are getting warning signs! Heed them!
You could do much better than the two PSU's you have mentioned in your post. Have a look at the Corsair RM***X series, or depending on where you live, have a look at the Seasonic S12II. Both very good quality PSU's, and for the same wattage you have now, should not break the bank.
Hope this helps.
K.