CRGreathouse said:A typical Bbn8 has a Will save of +2 (+2 base, -1 Wis, +1 cloak).
A typical Mnk8 has a Will save of +11 (+6 base, +3 Wis, +2 cloak).
A LG halfling Brd1/Clr1/Drd1/Exp1/Mnk1/Pal1/Sor1/Wiz1 with 18 Wisdom, 20 Charisma, and a +5 cloak of resistance (93% of his/her baseline) has a Will save of +29, the best possible by that level AFAIK.
A Com8 with extremely poor rolls and ability damage has a Will save of -3 (+2 base, -5 Wis).
Let's see what we can do about the Save DC.

Human Sorcerer, 18 Charisma to start, 19 at 4th level, 20 at 8th level.
Feats:
1st: Spellcasting Prodigy (+1 Save DC to all spells), Bloodline of Fire (+2 Save DC to all [Fire] spells).
3rd: Spell Focus (+2 Save DC for one school)
6th: Greater Spell Focus (Another +2 Save DC to one School)
Spell: Level 2 Eagle's Splendor (1d4+1 enhancement bonus to charisma)
This gives us:
10 (base)
+ 5 (charisma)
+1 (spellcasting prodigy)
+2 (Bloodline of fire - fire spells only)
+2 (Spell Focus - one school only - let's pick Evocation)
+2 (Greater Spell Focus - Evocation)
+2 (Eagles Splendor on a roll of 3 or 4)
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DC 24 + spell level on fire based evocation spells.
DC 22 + spell level on all other evocation spells.
DC 20 + spell level on all non-evocation fire based spells.
DC 18 + spell level on all non-evocation non-fire based spells.
A Fireball from this guy would be Reflex save of DC 27.
Take Twin Spell at 9th, and Energy Substitution (Fire) at 12th, and he would be able to convert any energy spell to a Fire spell, and cast Twinned Snilloc's Fireball Swarm.
If you dropped Bloodline of Fire and went for Enchantment on the Spell Focus Feats, it would be a DC 25 Will Save for a hold person.