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Sapper,
There are an equal number of protons and electrons in the human body. This is obvious directly from Coulomb's law. Even a miniscule charge imbalance would generate huge forces that clearly do not exist.
Why are you worrying about isotopes? Just use the the masses given in any periodic table. These already correctly weight all the different isotopes in their natural abundances. Our bodies do not hoard particular isotopes (at least not significantly).
The human body is mainly carbon, oxygen, and hydrogen. These have 6, 8, and 0 neutrons respectively in their most common isotopes. Less common ones are very rare, and can be neglected. Standard chemical groups - CH(n), COOH, etc clearly have more mass in the carbon and oxygen atoms than in hydrogen, so the proton:neutron ratio will be pretty close to 1. The proton:electron ratio is however extremely close to 1.
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