I don't think it would overstocked, but there are some problems with the fish you want. The rams and angelfish should be fine, but make sure you don't have two male rams cuz they can get territorial. Barbs can be very nippy and might nip at the angelfish's fins. You would also want to stick to one kind cuz the tigers will probably pick on the cherry, they also link to be in groups of 6 or more. As far as the zebra plelco goes, a true zebra pleco will be very expensive. The false one will be cheaper and both will probably be hard to find.
cheers,
mikaila31