[Kaleban]

Dual-classing works like this: your second class must surpass the first class in level before you gain back your abilities, so you'd need to be a 7/8, not 7/7.

Are you dualing to a mage or cleric? If cleric, you might think about going with Flails rather than mace, because if you go into ToB, you'll get more mileage out of the Flail of Ages. If Mage, you could go with Quarterstaff instead, and when you gain back your levels, you'll be absolutely deadly with the Staff of the Magi, and later the Staff of the Ram (a +6 weapon in ToB).