Well, three that I own that should probably be on the list are the collapsible Summicron; the 50/3.5 Elmar; and the Summarit 50/1.5. I also have the Summaron 35/2.8. Mine is in bayonet, but it was also available in LTM. Many would add the f/3.5 version of this lens. I tried the 50mm Summar, wanting to see the "glow" for myself. I didn't keep it, having quickly gotten my fill of "glow" but some folks really dig this. The 50mm Hektor should be mentioned just because it is so "cool" looking. A definite collectible! In fact, if you get The Viewfinder, Tom A wrote up a nice article on that one, several years back. The 90/4 Elmar should definitely be on the list, as should the 85mm Summarex.
I'll stop now, as I don't want to get into naming every lens! These are the ones that come immediately to mind for me. I find the 50/1.5 Summarit especially noteworthy because of how it became the basis of the 50/1.4 Summilux. Not only that, but in Walter Mandler's hands, its basic schematic became the basis of the Canadian version of the Noctilux as well!