[panchoman]

plugins that i use and recommend:

addtime plugin (addtime.smx)
alltalkmanager.smx
ammopacks
medipacks
fake death spy plugin
custom votes is very useful
also, we use bonus round respawn, its always fun and works great, check if you want this or not though, also theres pre game mayhem which is like this too
connect announce (cannouce.smx) -very good plugin
meleemode.smx is good if you want it
.. also sudden death melee plugin (sdmr.smx)
quick messages is very useful for admins as well,
votemute
votescramble
etc
etc
of course theres radio, soucebans, spray tracer, etc. that crimson mentioned

my recommendation: just go through the 15 pages or so of approved sourcemod plugins and pick out the ones that you like!