I would recommend a videocard capable of outputting proper 1080p24 through HDMI.
Because you want a judder free output right?
I don’t think nVidia has good enough clocks in their cards to do this reliably yet.
Go for a good HTPC videocard from AMD.
I don’t recall ever seeing any judder problems with the output of my NVidia cards. I have read that there may be issues with AMD cards in full RGB mode, though. And you need full RGB mode if you want to avoid colourspace round-trips.