There have already been some price reductions on the entire Nvidia line recently.
I think specifically you will see another reduction on the mid tier cards because yesterday the 7870 and 7850 officially went on sale for AMD/ATI.
The 7850 is priced @ $249. It beats the 560 Ti in all benches and seems to be just behind the 560Ti 448.
Someone else will need to chime in on your PSU query.