not that important a point, but barring the GT, all the cichlids you've listed are CA
i've just started keeping CA
's and SA's, so don't count on me for experience, but i'll try to give an opinion. please bear with me.
in a 6' tank, all the cichlids mentioned would probably work with well thought-out decor. the FM would be the least aggressive (though there are exceptions), but IMO
would hold be able to hold its ground.
try not to get a pair of convicts, as that puts added stress on the rest of the fish through breeding. 1 male would do fine. again, a breeding pair of Texas, JDs, FMs, or GTs would be harder to maintain with all the fish listed.
then again, there are various opinions regarding stocking levels. and many would say ( 1 Texas + 1 pair GT ) or ( 1 GT + 1 pair JD ) would do well in the tank.
just keep in mind, that there are no hard and fast rules in maintaining CA
communities. and please take into account advice from other experienced aquarists before jumping in and buying fish.