Good analysis. I might spend my proficiencies a little differently, but other than that, the Berserker/Cleric is a good combo (I've finished the game with one before). Also nice is the ranger/cleric (don't need a kit for this one), since this combination gives you access to both cleric and druid spells (and not just for the ranger spell slots, either; you get both types of spells to fill ALL of your slots). This character combination makes Jaheira obsolete, as you can cast all of those nice spells that she can cast (more of them than her at higher levels), cast all the cleric spells, turn undead, and fight well, too (can put 3 slots in dual wield, with 2 coming as a class bonus; can also specialize in the sling). The only problems as compared to a berserker/cleric: can't become a grandmaster, and miss out on the enrage ability. I agree (depending on your playing style) that berserker/cleric does have an edge, but to each their own.
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Death is only the beginning...