well? answer me you lot, or i shall command relix to smite you all! seriously, this is a conundrum. heres the competitors in the blue corner The DSR3 And in the other blue corner The DS4 help meh
Bit-tech award on the DS3R page DS4: Differences: Crossfire, better heatpipes, firewire. You can't even Crossfire on P35 because no ATI drivers are officially available yet though.
If you don't need crossfire or firewire onboard, just go with the DS3R, it should do everything you'd need.