Fully agreed with Pretor, go for Intel 2.8 Series C, If he wouldnt have recomemnded that, I would have recommended that myself. this is far most best price/performance match. , though your buying of Intel Springdale Chipset is a very wise decision.
other than these you write, you forget to add another, that is Intel 3.2/3.2 EE (where EE stands for Extreme Edition) also called Prestonia Chipset, based on Northwood Core on 13 nanometer technology.
the 'E' series, Prescott, though runs hotter, besides having 3 advantages over C series Northwood, that are SSE3 Multimedia Instructions added. 9 Nanometer fabrication technology and 1MB L-2 Cache.
C series have 512K L2, (Northwood) - Price less than Presott
EE has 512K L2 + 2048 L3 (Prestonia) - Most Expensive
E has 1024 L2 (Prescott) - not as much expensive as they are newest in this written series, but are supposed to be.