If you're into the rarified atmosphere of the RS2 then pricing can get a little weird. The right car, even with 60k, could be worth over £15k, a nail on the other hard will probably fetch less than an equivalent GSR, i.e. <£12k.
As with buying any Evo, especially an older one, condition, number of owners (particularily the length of time in the current owner's hands) and provenance are more important than anything else. A high-milage car with good history will be a far better proposition than a low-milage example that has been owned by a ******