Converting Vancian to Spell Point Casting?

[lesser_minion]

A while back, I hacked together some guidelines for translating the 3e core casters to spell points. I ended up with roughly the following:

• Points cost = Level of required spell slot.
• Daily limits:
  
  • Sorcerer: 3 x Class Level + Max. Spell Level
  • Cleric/Druid/Wizard: 2 x Class Level + Max. Spell Level
  • Bard/Paladin/Ranger: Class Level + Max. Spell Level
• For Clerics and Wizards, only the class level component of their spell points may be spent freely. The spell level component must be spent on domain/specialist spells.

This should not give casters too many extra uses of their best spells (it definitely doesn't at 20th level), but it hasn't been playtested and might be too limiting in practice.