Intel's i945 and i955 chipsets are the first to support dual core Pentium D CPUs. The i955 is the "Performance" part, while i945 is more geared to value. Although the price difference between both is quite big, the technical differences are rather small. I955 has support for up to 8 GB of ECC memory, while i945 can support "only" 4 GB of non-ECC memory, not really important for you, as long as you don't plan on running a high-performance server. The other difference is that i955 features Intel's proprietary "Memory Pipeline Technology". According to the Intel Website it "enables a higher utilization of each memory channel, accelerating data transfers between the processor and system memory and resulting in higher system performance".
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