Hi littlemage,
Unfortunately, all things aside, Yorick is correct. There are no really good devastating bastard swords in BG2. Longs swords also lack, though there are some better. As far as swords go, 2HS rule. This may have been incorporated as a matter of character balance, since fighters rely on their sword ability. It may have been deemed an imbalance if mages could wield swords that are too powerful.
If you want to have a mage who can use powerful 2HS's, you may want to consider a Kensai fighter and dual class him as a mage. This character is very popular and deemed by many to be the best.
GL
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