Loads of misinformation in here, love it!
Evos are very common tbh, I do a fair amount of travelling and must see at least one Evo a day. Saw two 8's today, one a silver 260 poverty spec with the small wing and one in Wilkys colour. I even saw two Clio Trophys today, how weird is that! 350Z are also very common as are S2000's so I don't know if you girls drive around all day with your eyes closed or what.....
£18k wouldn't even get you a half decent R34 GTR. If you're only looking to spend £8k this is well out of your price range!
I think I'd stick with S15 tbh, rust isn't an issue any more than anything else of the same age. Never see them about, great looking and it's not the "predictable" choice
Oh and S2000's are great! A puffs car? Is that coming from someone with an orange Punto, and a poor mans M3? lol pull the other one.