I loved Sports Night but Aaron Sorkin used the same schtick over and over - I think SorkinEra!West Wing is actually a better show but it suffered the same fate.
Change "loved" to "hated" and "but" to "and" and I'm 100% on board.
Michael Fairman, who played Niska on Firefly, was the guest star on the 'KRP turkeys ep & he co-wrote five episodes with Richard "Les Nessman" Sanders. And Sam "Holland Manners" Anderson was the INS (FBI?) guy in the one where the Russian guy fell in love with Bailey & tried to defect.
I'm paralyzed by decision-making so no list for me, but I love most of your favorites (Aaron Sorkin notwithstanding). And the first 3/4 of S2 Angel was the show's peak. I'll throw in another 'verse crossover, Ron "Call him Book but he'll always be Harris to me" Glass's real claim to glory, Barney Miller.