Welcome aboard
Convict, FM, Salvini, Jewel and Acara are all good size of cichlid of to suit the tank. GT and JD would bit a bit large as said. Jewels lean more toward living with American cichlids in terms of water suitability and diet as they are a River species and not found directly in the Rift Lakes amongst the others. Their behavior differs a bit from American cichlids but on the most part they will usually get along ok. Best to avoid all other African species though unless you plan to have a completely African tank, the Jewel is kind of an exception to the rule.
Large cichlids can sometimes eat small plecos but they are not particularly inviting to eat as they have spines and are tough. Usually if the fish grow up around plecos they just know/learn to leave them alone.
You could maybe build up the back corner and walls of the tank with terracotta flower pots to create caves and leave front area as clearer space, I've seen a lot of corner African cichlid tanks set up like that and it looks/works pretty good.
