A list of tortoise varieties and sizes from TortiseCare.org
Be aware that they are a big commitment and live VERY long..
Sulcata Tortoises: 20-26”
Leopard Tortoises: 14-16”
Redfoot Tortoises: 12-15”
Yellowfoot Tortoises: 15-17”
Greek, Russian, Hermanns Tortoises: 6-8”
Indian Star Tortoises: 6-8”
Hope this helps!