Yes it is.
A) The 4670 has a higher single threaded performance level over it's 3rd gen brother the 3570. Automatic better.
B) The Corsair PSU is of much higher quality than the no name they were trying to give you. Makes a HUGE difference for reasons I explain in my thread
here.
C) The Samsung 840 Pro sports faster IOPS and write times compared to the standard 840 which makes it more expensive.
Now, would you notice the difference between these parts? Probably not, but if you're spending the money you might as well get the latest and best on the market. As to the PSU, it's always a MUST to have the best quality you can put there. After all, it sends electricity to all your fragile electronic components.