Hey,
i am after a really good tape sim, not as a special effect but more as a desirable tape quality. I am very fond of reasons scream and the tape sim on that although a bit to extreme on occassion. I have tried most out and it would make me very happy 
in the meantime, check this out:
http://varietyofsound.wordpress.com/2009/10/29/ferrictds-released-today-withi-the-kvr-dc09/