As much as I like Better Cities I have some FPS issues running the latest versions of it.
So I started playing with some of the other mods that change IC from the vanilla city Bethesda made. Current list include
Unique Landscapes - Imperial Isle
ImpeREAL City - Unique Districts,
Reapers Arcane University (version 4),
Clintmichs Beautiful Arboretum,
Imperial City Palace Gardens,
Momos Harbor Expanded,
Talos Bridge Gatehouse,
Better Imperial City Textures and oh yeah Just Another Alternative Arena Poster Re-placer.
So far no problems, but then again I could be missing some patch I don't know about.