I got a set of (run-out) Diablos from Cycletreads. They didn't have many 170 rears left, but had a whole lot of 180s if you wanted to go for that (dunno if they still have any but).
Haven't used a full set yet, so I can't comment on the wear, but the old set seemed to be wearing quite slowly (despite the fact that I am a husky gentleman). They were on the bike when I got it. I did about 4000 miles (~6000km) and they comfortably passed a WOF about 3 weeks before they were swapped.
I do, however, ride like a little pigtailed girl, so people who can actually ride may be able to tell you more about wear.
If you ride Frosty's (with the 180), you can have a go on mine too (with a 170) to compare which you prefer. I'm about 2km from Frosty's place.
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