taking Prestiege paladin is pretty much a terrible idea, for these reasons:

Half the spellcasting of Paladin. just because you normally only gain every other level to spellcaster level, doesnt mean that loosing 1 paladin casting progression every other level is worth it.
there are NO acfs for Prestiege paladin. the way PrC paladin condenses makes ACFs and substitution levels even more of a headache to take.