Yeah i like the S1 but deffo watch out for XR3i shells with S! engines, or ringers, my bro bought one a few years ago, he jumped in it & it was rapid so didn't check any other bits on it, when he sold it the guy came back to him for some money back as it wasn't a propper S1 !!
Hate the way they handle & drive though, much prefere my GTT.
I've had a few different cars ,260bhp rover tomcat on cams & management, chipped Scooby, uno turbo & 3 GTT's & still prefere my GTT, also driven cossies, evo 5 & 6, Sti's, 200sx, just something about GTT's.