XXXi mobos are not that bad I must say. Especially if you are considering 2xNVIDIA GPU, then it is the only choice. I don't think a P35 can run SLI, esp. since it's default can only one PCIe 16x.
If you are not considering to overclock, the default fan (that come with the CPU) is enough. I'm running E6750 CPU extensively (for gaming, movie, work etc) and have no problem with default fan.