Looking at some new lenses..

[illuminati_02]

Hi. I had a complete CLE kit and decided to sell the 28 and 90, and want to pick up some new lenses. I love the Rokkor 40/2 and did not use the other 2, and did not feel I would use them enough to keep them. I know I am going to pick up the Ultron 28, but are there any other must haves for the CLE? I know the 40 Nokton is nice, but as good or better than the Rokkor? or different enough to need both? I was also thinking about the 15..
Thanks for your suggestions.