Lung epithelial cells (e.g. A549, Calu-3) - As SARS-CoV-2 infects the respiratory tract, using lung epithelial cell lines makes sense as they would be physiologically relevant. The virus can directly infect these cells and elicit an inflammatory response.
Macrophages (e.g. THP-1, U937) - Macrophages play a key role in cytokine release and inflammation during viral infections. THP-1 or U937 human monocytic/macrophage cell lines could be differentiated and infected with SARS-CoV-2.
Dendritic cells (e.g. monocyte-derived DCs) - Dendritic cells bridge innate and adaptive immunity, detecting pathogens and promoting cytokine/chemokine secretion. Generating monocyte-derived dendritic cells and infecting them with SARS-CoV-2 is an option.
Endothelial cells (e.g. HUVECs) - The endothelium is affected in COVID-19. HUVECs (human umbilical vein endothelial cells) could be used to see endothelial activation/dysfunction.
You may use human hepatoma 7 cell line (Huh7) for your study as these cells are highly permissive for SARS-COV-2 replication. Many cytokine-related genes, including chemokines, interleukins, tumor necrosis factor, and IFN are upregulated upon viral stimulation in Huh7 cells, suggesting the presence of a cytokine storm. Using this cell line of liver origin would be interesting as the liver has been identified as one of the main target organs in cases of COVID-19.
For more information you may want to refer to the articles attached below.