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#21
Since 1080P editing is the primary purpose of your PC, you can likely take advantage of the hyperthreading available in the 2600/2600K, which is not available in the 2500/2500K.
The choice between the 2600 and 2600K is driven by whether or not you have overclocking intentions.
If you have overclocking intentions, get the 2600K and a motherboard with a P67 or Z68 chipset.
If you do not have overclocking intentions, you may as well get the 2600, with an H67, P67, or Z68 chipset.
Many would tell you to get the 2600K rather than the 2600, even if you won't overclock, since the price differential is so small.
I'd concentrate my time on locating a source for good motherboard brands and good power supply brands. You can get the processors anywhere.
If you are not going to overclock, the stock Intel cooler is fine. If you go for a moderate overclock, you may have to buy an aftermarket cooler.