If you haven't looked into them I would highly recommend the Argentine Boa. They are big, beautiful, and docile. My roommate had one that I was awesome. I'm considering getting one of them, I really miss toko! Another great option would be a dumerils boa, also get larger and heavier and is very docile. Of course balls are also a great first snake. I started with 1 now I have 10 lol. Can't have enough ball pythons!