inorganic chemistry - Which d-block cation has the maximum hydration enthalpy?

Among $\ce{Mn^2+}$, $\ce{V^2+}$, $\ce{Ni^2+}$ and $\ce{Ti^2+}$, which cation is having the highest hydration energy to form the aqua complex $\ce{[M(H2O)6]^2+}$?

I guess $\ce{Mn^2+}$ should be the answer as it has the most stable electronic configuration.