1 Point Blank Shot, Toughness 3 Zen Archery 6 Weapon Focus: Sling 9 Extend Spell 12 Great Fortitude 15 Knockdown 18 Improved Knockdown 21 Epic Weapon Focus: Sling 24 Great Wis I 27 Great Wis II 30 Great Wis III 33 Epic Fortitude 35 Improved Evasion * 36 Epic Skill Focus: Discipline 39 Dragon Shape
AB: 25 base +10 Wis +1 WF +2 EWF ______ 38 w/ mundane sling
AC: 10 base -1 Dex +8 Full Plate +3 Tower Shield +8 Tumble ______ 28 AC naked and unbuffed
HP: 420 max unbuffed (in human form)
I realize that this build is similar to some of cdaulepp's builds, but this one seems a little more playable to me. It doesn't get an Uber high AC because it doesn't have any Monk levels, but with your Cleric buffs you can still get a decent AC.
I chose Rogue rather than Monk both because it gave more skill credits as well as more damage. Even though this character doesn't have an Uber high AC, he does get a decent Fort save (31 in Human form, 40 in Dragon Form), and you can use buffs to boost this even more (+1 Prayer, +2 Battletide, +2 Aura of Vitality, +1-2 Endurance). The total Fort save is 46-47, which isn't bad, although there will probably still be some people who will be able to Dev. Crit. you.
Additionally, you get 40/- DR in Dragon Form, and you have huge health, so you can absorb a lot of damage. If you find yourself getting your butt kicked, you can shift out of Dragon Form and cast Heal, which will get you to full health and only takes half a round to cast, assuming you still have Haste active.
The Rogue levels are particularly useful in Human form, allowing you to do decent damage against enemies that are not vulnerable to sneak attacks, even with a Sling, which is generally considered to be a weak weapon. Note that you don't need stealth to make use of sneak attacks; You get Improved Invis. at CLeric lvl 7, and before that you have Darkness/Ultravision. You also have summons, including an animal companion that will help tank for you.
Your buffs will boost your AB up quite a bit:
+5 Divine Favor +5 Divine Power +1 Bless +1 Aid +1 Prayer +2 Battletide +5 Greater Magic Weapon +1-2 Owl's Wisdom _________ 59-60 AB with a mundane Sling
Of course, you may need magical ammo to be able to overcome the DR of certain creatures, but you have some decent damage spells, and the DCs are decent due to your high Wisdom. Of course, you might have trouble beating SR at higher levels, but you do have the Druid spell Nature's Balance, which will lower your enemies' SR, although it does give them a save.