New Castle Knights

I love legos. I'm too old to play with them now, but every once in awhile, I will come in a fresh set and buy it just for collection. There were many fresh themes over the years, and I do not really care for the new. But I was curious what everyone elses favorite lego theme was / is it?

Here are just a few ideas to refresh your memory:

Pirates and / or Imperial
Robin Hood, Men Forestry /
Knights (whether old or new, are like the old hawks new knights of the Castle series)
Space Police
Civil War
.. etc.

I like the new.