not sure how the e7500 snuck in there.
If you were considering older chips because you had the right socket, you can easily get an e8500 (used, but hey) for <£50
but a straight fight between i3 and e7500, probably the i3 twice over.
On a side note, the e8500 is still a competitive chip and I recently upgraded with one from an e5200 or something.
Stable at around 3.9Ghz overclocked if you're into that, though I think my m/b is holding me back on that.