Yes, you should definitely consider another PSU. The Extreme Power Plus series is one of the worst PSU units ever built by Cooler Master. It is a very low quality PSU, which means it would age really fast, and even faster if it is under load most of the time everyday...
So, if you've been using it around a year, then I'd say replace it with a better PSU. You wouldn't want to risk your new components...?
I won't recommend this PSU to anyone unless somebody plans to use it for very low end needs.
Now it's up to you.
Who knows, your PSU is be the reason for your burnt motherboard...?
As for the motherboard and processor, you've already got some good recommendations.