best addons for a server

M9K, a nice anti-prop kill (ap-anti is good). ULX, or any decent admin mod tbh. Some custom models, not 100's that you're never gonna use. Some nice paid/leaked addons on here. I've seen an addon on here called bodygrouper or something? I've used it before and that's really good, lets you change your bodygroups on your playermodel.

Get CAC Anti-Cheat to keep some cheaters out.
Pretty much all I can think of right now.
Good luck!