Oh, not to mention...
Monks are immune to disease (5th), poison (11th);
and they get Still Mind at 3rd level which gives a +2 bonus to saving throws against spells and effects from the Enchantment school.
A few more reasons why they need no saving throw boosts.
But I thought about and realized your biggest flaw - the Paladin level grants a +1 BAB. And in IWD II, if you get +1 or more BAB from any other class as a multi-classed Monk, you lose the benefits of the Monk's special unarmed attack table. So here would be an end-game comparison of the pure human Monk to yours,
fighting unarmed:
Human (16th level, all Monk):
4 attacks, BAB +12/+9/+6/+3; damage is d20 per attack
Aasimar (15th level, 1 Paladin, 14 Monk):
3 attacks, BAB +11/+6/+1; damage is d12 per attack
Not to mention the Human, if built with an 18 Str, will have another +5 advantage to hit and to damage.
I'd say that is quite a steep cost, and if you still think a Human stinks up the room compared to your Aasimar, well we'll never agree, *lol*
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