The i5 is by far the best price/power point right now. I'm a big AMD fan, but this destroys anything they have out right now, and cost me far less than most of their entry level processors. By getting it on Black Friday with a bundle discount, it set me back $80.
That thing will rip a 22gb blu-ray 3D movie to MKV in about 45 minutes, and leave enough headroom to still use my computer for other things. And this is using XP. I'm only getting neutered performance do to my disinterest in W7.
How fast are you running the I7 with that cooling block?