My most wanted (and ones I can't believe haven't been released) are:

Raise the Red Lantern.
Ju Dou
Red Sorghum 
To Live - all by Zhang Yimou

Red Firecracker, Green Firecracker - Ping He

Cyclo - Tran Anh Hung

Anything from Hou Hsiao-hsien

We're also missing some of the best Bresson films in the UK as well.

Cheers Trev.