If you want the ultimate Evo 2 model you have to like blue-black as all but two of the 502 built were delivered in that colour.
Main rust checks are: below rear screen; inside arch lips behind aero panels; jacking points; inner wings; boot floor.
Whining and unusual noises from the diff are not uncommon on these but it can be expensive to fix.
The quick-ratio steering rack puts extra strain on the system so check the pump and pipework for fluid leaks.
Water from leaky sunroofs can run down inside A-pillars causing damage that’s unseen until serious. Sniff for damp and beware fogged windows.