Nvidia or Radeon - Games and Video Editing

Hi... I enjoy playing NHL 2003/4 and also like to do a bit of video editing.

Thinking of getting the 256 meg FX5600 Nvidia Card with VIVO.

Is this a good choice or should I give one of the Radeons a go. They only seem to have 128 meg of ram.

Thanks in advance

P4 3.0 ghz
1ghz mem