It depends on what or how much are you willing to wait. If you think things are going to change in two weeks, then think again.
When nVidia releases all the 6xx series cards then and only then will the price will come down.
So you might be waiting for up to 3 or 4 months. Right now nVidia only has one card out. So AMD might lower the 7970 but that is it.
You will have to wait to see what the other cards bring. Oh yeah you should not put two threads at one time it is a no no.