Hi scudney thanks for you intrest, i removed the timing belt cover and the timing belt looks resonably new i.e. still has white printed writing on it that hasnt worn off, also i have sanded and undersealed the bottom of car so my concerns have been put on hold for now as it is such a good car. I was looking at is300's but just cant bring myself to buying an atuo. And also due to age of them i will be looking at the similar age related issues bushings, rust ect.
So i have decided i will drive my is200 till next year then change to is250 when insurance renewal is due maybe... sorry i still havent decided 100% but the is200 is such a good car.