IMO the bristlenose pleco is a good one to put with chichlids. They stay smaller than most (about 12 cm). Though they are not very attractive they are good workers and chichlids leave them alone. They are fine with the higher pH that the chichlids require, but do like to have some wood in the tank to suck on.
you do realize that that "regular" pleco can get up to 2'? also plecos require wood in the tank to rasp on. if you do decide to go with a plec i would go with one of the smaller species