#5. The most reliable high-AC character - no level checks needed to activate scrolls, and has got the minimum Intelligence (11) necessary to activate the arcane scrolls without having to make Use Magic Device checks to emulate an ability score.
Halfling Cleric 1 (Magic domain)/Monk 1.
32-point buy statistics - Str 6 (8 -2 racial), Dex 18 (16 +2 racial), Con 10, Int 12, Wis 18, Cha 8.
Feat: Dodge
Skills: 5 ranks of Tumble
Gear: scroll of mage armor (25 gp), scroll of shield (25 gp), scroll of reduce person (25 gp), potion of barkskin +2 (300 gp), potion of owl's wisdom (300 gp), Total 675 gp
After casting shield of faith and using all items, he has the following statistics:
Tiny Humanoid (halfling), Str 4 (8 -2 racial, -2 size), Dex 20 (16 +2 racial, +2 size), Con 10, Int 12, Wis 22 (18 +4 enhancement), Cha 8.
AC 10 +2 (size), +5 (Dex), +6 (Wis), +4 armor, +4 shield, +2 deflection, +2 natural = 35
If he takes the total defence action, he gains a +6 dodge bonus for AC 41, 42 against his dodge target.
The riskier version has the following gear: scroll of mage armor (25 gp), scroll of shield (25 gp), scroll of reduce person (25 gp), scroll of alter self (150 gp), scroll of cat's grace (150 gp), scroll of owl's wisdom (150 gp), potion of barkskin +2 (300 gp), Total 825 gp
Since he has the necessary Intelligence or Wisdom to activate the 2nd-level scrolls, he only needs to make a DC 4 caster level check to activate each of them. Since his divine caster level and his effective arcane caster level are both 1, he has a 90% chance of activating each scroll (3 to 20 on d20).
Assuming he succeeds at activating all the scrolls (72.9% chance), and casts shield of faith, he has the following statistics:
Small Humanoid (halfling, troglogyte form), Str 4 (8 -2 racial, -2 size), Dex 24 (16 +2 racial, +2 size, +4 enhancement), Con 10, Int 12, Wis 22 (18 +4 enhancement), Cha 8.
AC 10 +1 (size), +7 (Dex), +6 (Wis), +4 armor, +4 shield, +2 deflection, +8 natural = 42
If he takes the total defence action, he gains a +6 dodge bonus for AC 48, 49 against his dodge target.
To avoid arguments, assume that he activated the scroll of alter self before he activated the scroll of reduce person (since alter self changes size) and drank the potion of barkskin.