I was actually thinking it the other way around: Save the 970, get rid of your current computer for a reasonable price and build a dedicated modifiable SUPER gaming rig around your existing 970. It is a very good card. Then someday when you feel you'd need a little more oomph, upgrade the 970 to whatever is the best bang for a buck at that date.
Also, the Dell you now have has some value without the 970 as a reliable banking/surfing/e-mailing/office computer.