The i5-3450 is currently priced at 199.99, the Phenom II 965 is priced at $120, Thats a $80 dollar price difference, I'm sorry, but when we're talking about a 600 dollar system build, I wouldn't consider 80 dollars to be "slight".
The Phenom II 965 can have the multiplier set to 18.5x giving it the same settings as the identical 980 model, as both CPUs ship with the same stock cooler, effectively making the clock speed 3.7GHZ.
Lets say for the purpose of a reasonable discussion (God, it would be nice to actually have a reasonable discussion with someone about this for once on these forums, don't let me down) for the record, I own a system with an i5-2400 paired with a GTX 460 video card (its my boyfriend's computer).
Between that system and the one in my signature, both systems perform the same in games with no noticeable difference in gameplay. I will stipulate there is a difference on paper, however, again, owning both system, I cannot say that one "mops the floor" with the other.
The link you gave, which I have seen before BTW, doesn't really cover a lot of information.
This one has a little bit more info.
http://www.anandtech.com/bench/Product/363?vs=362
Now, 60FPS is the limit of a typical computer monitor, any CPU that can hit that limit in a game is "golden". Although in terms of smooth gameplay, 40FPS is more than sufficient for a fluid experience.
Now if we want to discuss your article, I assume its your article (which I did read and find very informative, but I'd like to show you this:
Originally, The FX series CPUs were slammed by most review sites, and for good reason, initially they were far too expensive for the performance they offered at stock speeds. Which matters greatly for 90-95% of all computer users out there as the number of people who overclock is still relatively low, however, based on this very comprehensive article, its clear that the FX series really can "come alive" when you overclock. (And lets face it, anybody in the Homebuilders section should be considering it)
Newegg now offers the FX-8120 for $170 dollars, in my opinion, priced exactly where it should be on the hierarchy.
http://www.overclock.net/t/1210060/fx8120-vs-2500k-benchmark-results