What brand and model of upgradable clinical microscope is best for vet, choose between Nikon and Olympus?

My choices are Olympus CX 31 or CX 41, Nikon 50 i, E200 or E200F. Choose the optimum one for vets. I am from the Philippines (a humid country). can I contact you directly? The CX31 will be virtuous for you. UP VetMed has olympus microscopes..Please ring up 727-1058 (Manila number) and look for Frances, (Olympus dealer). We can give you a demo and relieve you choose. We can also give you a ring.