Which RB to start - (what a mess!!)?

I have Gore, Lynch, Dunn, and D. Rhodes. I started Gore and Lynch all year, but am thinking Dunn and Rhodes would be the way to go with Gore's injury and Lynch has been crap. Or should I pick up Justin Fargas, Jamal Lewis, Darren Sproles, or Chester Taylor. I have to start 2. Thanks so much for the input.