I happened across this recipe and tried it last night.  It was
outstanding and very LC without modification.  I did sprinkle some
smoked paprika on part of it to try out and thought it's a nice
addition.   Costco is a good source for goat cheese, its about 1/4 the
price that it is in the supermarkets here.  I also cut down on the
cheese and cream a bit, as it seemed more than enough for what I would
say was a large cauliflower.

Here's the recipe:

http://www.foodnetwork.com/recipes/bobby-flay/cauliflower-goat-cheese-gratin-rec
ipe/index.html