Thanks for all the feedback! :)
Since I'm American it's definitely Ell-a-nor, though sometimes with a softer -ner at the end.
If I did go with Susannah (for my as yet unconcieved baby :o), she would probably be an Annie rather than Susie. I love, love, love Annie Rose (I know, double names) but would like it to be short for something like Susannah Rosamund rather than the stand alone name.