Since it's not multithreaded, the dualcore should be a lot faster. Probably cheaper to?
Also consider the AMD Opteron platform, they don't have plans to change their new socket any time soon, so a socket f / 1207 should last way into the quadro era and possible further. Also while Intel has cached up a big bit the last half year moving away from the Netburst (pentium4) architecture, AMD is mostly still the king of price / performance / watt.
