With no gaming or just casual gaming, the PSU is fine.
On that note, forget the AMD CPU and mobo and even the videocard for the moment ($365 together).
And buy this Core™ i5-3570K Processor w/ Gigabyte GA-Z77X-UD3H Motherboard bundle for $369
http://www.memoryexpress.com/Product...3570K_Z77XUD3H
I'd also swap the 1TB Seagate for $99 for the 128GB Crucial M4 for $99
http://www.memoryexpress.com/Products/MX35603
But I'm biased toward SSDs and advocate them in EVERYTHING.