Ahh, very good, thanks guys.
I didn't see the Spell Engine or Rary's Arcane Conversion trick for swapping out the heightened spells for 9th level spells.
I gotta say though, I don't agree with the Handbook's take on Spell Engine. I don't think it stays in effect if you leave any of your spell-slots unprepared. I think the duration expires when you stop the process of preparing spells. (or at least that looks like RAI to me). With the cost involved with Spell Engine, I'd rather go with Rary's Arcane Conversion.
I also didn't realize that the process proposed here included soo many iterations of circle magic. If a group were to take days to wind-up, 23 iterations could be to dupe spells, and the 24th iteration could up caster level every day (just in case something tried interrupting you). Definitely want warforged or someone to cast Remove Fatigue.
On second thought... I'd almost feel dirty trying this on my PCs.
(edit):
Yeah, carnivore, that still applies pretty closely to the Circle Magic feat, which only allows you to get 10th level spells.
I really want to optimize that feat in an e6 game, where it would be the most awesome thing ever.
I want to look closer at the Circle Magic feat when I get home and can access my Ghostwalk book.
In an e6 game, you are still limited to knowing only up to 3rd level spells right? Rary's Arcane Conversion is 6th level, and Spell Engine is 8th level.
I don't think Uncanny Foresight (did you mean forethought?) would help you.
UNCANNY FORETHOUGHT
You cunningly prepare your spells for any exigency.
Prerequisites: Int 17, Spell Mastery.
Benefit: When preparing your daily allotment of spells, you can reserve a number of spell slots equal to your Intelligence modifier. As a standard action, you can use one of these slots to cast a spell that you selected for the Spell Mastery feat. The level of the slot used must be equal to or greater than the level of the spell you intend to cast. Alternatively, as a full-round action, you can use a reserved slot to cast any spell that you know. The spell is resolved as normal, but for the purpose of the spell, your caster level is reduced by two. The level of the slot used must be equal to or greater than the level of the spell you intend to cast.
That requires reserving a slot unprepared. Shuffling your heightened cantrips into higher level spells, requires that the spell slots be used.