The 2nd processor has a higher stock speed. If you aren't planning on overclocking, you should get the 2nd processor.
If you get the first processor, you will need to get an aftermarket heatsink, which start as low as $5-6, but can run much higher for premium parts. Tom's just did a round-up of budget coolers
, and there are certainly more available out there.This processor
is probably the best buy, as it's $1 less than your 2nd listed processor, but it's .1 GHz faster and comes with a heatsink.