RE: having 6 15th level powers at 15th level. Guys, think about this carefully for a moment.
Any non-wizard class at 15th level has three daily abilities that it can use per day. If you turn to the table in the DMG that covers creating higher level characters and/or look at the similar table in the PHB you'll not that they are generally expected to have a 15th level, a 9th level and a 5th leevl power, having traded up their weak 1st level power for a more potent 15th level power.
They can still only have one 15th level power. They might have two 9th level powers, but that would require that they traded up their 1st level (or even 5th level) power for a 9th level rather than a 15th level power. They cannot, under any circumstances, use multiple 15th level powers per day.
No think about how this applies to the Wizard. The spellbook feature let's the wizard select which daily power he has available each day from a larger list, but the wizard explicitly still adhers to the usual limit of powers per day.
Even if you were to load up your spellbook with six 15th level powers at 15th level, you still couldn't use more than one such power per day, and you lower level "slots" would go to waste.
Any non-wizard class at 15th level has three daily abilities that it can use per day. If you turn to the table in the DMG that covers creating higher level characters and/or look at the similar table in the PHB you'll not that they are generally expected to have a 15th level, a 9th level and a 5th leevl power, having traded up their weak 1st level power for a more potent 15th level power.
They can still only have one 15th level power. They might have two 9th level powers, but that would require that they traded up their 1st level (or even 5th level) power for a 9th level rather than a 15th level power. They cannot, under any circumstances, use multiple 15th level powers per day.
No think about how this applies to the Wizard. The spellbook feature let's the wizard select which daily power he has available each day from a larger list, but the wizard explicitly still adhers to the usual limit of powers per day.
Even if you were to load up your spellbook with six 15th level powers at 15th level, you still couldn't use more than one such power per day, and you lower level "slots" would go to waste.