Huh, my old PC packed away in storage has an E7200 in it. Maybe I'll try overclocking it.
I changed from E7200 @ 3.9 to Q9300 @ 3Ghz and i can tell you that it wasn't good choice. I didn't spend really any money since both i bought used cheap but aside from very few games like GTA or Crysis i didn't felt any difference.
Because even now games on PC love quick one-two cores than slower 4 cores. But now i see that there are a lot of games that start to use more than one-two cores so 7200 after OC won't do any good.