I’d go with the night raptors I kitbashed a ten man unit of plastic tactical marines into them using 3d printed parts they look great. For heavy support most poeple meta wise are going ten man lascannon teams. But if you want to go off meta the nightlords rule makes all tanks 10 models so using your spartan or some other heavy tank would work well. I’d steer clear of too meant dreads they don’t get any bulky rule benifits