CSL is a fantastic car. Had one for 8y. But they too have suddenly climbed. However, I don't think this market will go up forever. But as always, I just stick to buying what I love. Then what the values do after that is less important.
Cool colour. For me, I know I like a car when I'm not that bothered what colour it comes in. As with the 964, it looks cool in almost every colour. Its boring but I love it in black or blue too. But I'm not fussy.