I managed to dig up the list I used when I was rewatching it with my wife.

• 1.01 Midnight on The Firing Line

• 1.06 Mind War

• 1.08 And The Sky Full of Stars

• 1.13 Signs And Portents

• 1.18 A Voice In The Wilderness (1)

• 1.19 A Voice In The Wilderness (2)

• 1.20 Babylon Squared

• 1.22 Chrysalis

• 2.01 Points of Departure

• 2.02 Revelations

• 2.08 A Race Through Dark Places

• 2.09 The Coming of Shadows

• 2.13 Hunter Prey

• 2.15 And Now For A Word

• 2.16 In The Shadow of Z'ha'dum

• 2.19 Divided Loyalties

• 2.20 The Long, Twilight Struggle

• 2.22 The Fall of Night

Personally I would very much skip Soul Hunter. It's a bad episode, and it's plot relevance is only for one of the movies. I'm also really not convinced that Survivors is strictly necessary. I guess on that one I'd say give it ten minutes, and if you're not digging it then skip.

From Season 3 through season 4 just watch every episode, it's a really solid show by that point. Season 5 is basically a coda. Watch or skip based on how you're feeling by that point. The main plot functionally resolves at the end of season 4 because of network fuckery.