"I do a lot of video editing so I thought getting a better graphics solution might make things a bit easier."
The effect of the graphics card on video editing was discussed at length recently and the concensus seems to be that it makes little or no difference, confirmed by timed tests by those nice people at Holme...
See click here
For video editing, the processor's oooomph, plus /lots/ of RAM, make the most difference.
IMHO your current card is perfectly OK for vid. editing; suggest put the brass towards more RAM.
Duo or Quad processors add to the ooomph /only/ if your editing software is written to take advantage of them. (We use ULead's VideoStudio, and that is).