My experience with running and pubbing servers has been that the following maps tend to "kill" servers:
de_aztec
de_prodigy
de_assault
de_tides
de_dust
de_compound
de_port
..the following maps are usually favorites and safe:
de_dust2
cs_office
cs_italy
cs_piranesi
de_cbble
de_chateau
de_inferno
cs_militia
de_nuke
de_train
and the following maps, which although mostly only known by regulars and competitive payers, can be alot of fun to pub:
de_contra
de_beta_mill
de_losttemple
de_russka
de_cpl_fire
I would suggest including the typical "favorite" maps in the cycle.. and throwing in some of the mills, fires, contras on a regular basis..