Excal 1000, Excal II, Sovereign GT, CZ-20, Tiger Shark, Tejon, GTI 1500, Surfmaster Pulse, CZ6a, DFX, AT PRO, Fisher 1235, Surf PI Pro, 1280-X, many more because I enjoy learning them. New Garrett Ca
There is a difference between the earlier Excaliburs and the newer Excalibur II. I feel the II is a bit more sensitive and a bit more stable in certain instances.
I also like the newer coil on the II as it is thinner and glides easier through the water.
The 800 is a great machine and you should be able to make it pay for itself easily.