I think Roeg's finest moment was 'Don't Look Now'. One of the most disturbing Brit movies ever. Superb.
Saw it nearly 20 years ago - found the ending so shocking I've never been able to watch it again since.
I'd also tip the nod to The Witches. Atypical of his work perhaps but my niece likes it and I found it an enjoyable children's film - much better than average. Him and Roald Dahl make a good pairing I think.