Did you notice that that is a 24 to 20 pin adapter, and not a 20 to 24 pin, like you want?
Now, both of those parts, I would get neither of them. For AMD you want to go with DFI. Might i suggest this:
And for a PSU, you should really go with Antec or OCZ, somewhere along those lines.
I have this one, havent installed it, but it looks damn sexy! And it's OCZ, and you cannot really go wrong with OCZ.
There, some really killer peices, and still spending about the same amount.