This build was a self-imposed challenge - building a Straladin that is also a primary defender.

Well, how?

First, it is a Half-Orc, which means Blessed Strength and Mighty Challenge.

Second, it uses In Defense of the Order with Bitter Challenge, Weakening Challenge, World Serpent's Grasp, Overwhelming Impact and TONS of other things to make its mark punishment THAT painful.

Third, it has resist all 17 simply from his marks, with actively +4 to all defenses, no matter what.

Fourth, he's got one mass stun, one daze-weaken combo (on top of the Divine Saction), one mass Sanction and one "drag everything nearby". Every encounter.

Fifth, strong multimarking capabilites through Call of Challenge and None Shall Pass (every encounter), excellent Resist All bonuses via Shield of Discipline, Deliverance of Faith and Virtue and good defense bonuses from Divine Aegis (which is now every encounter) make him VERY good at surviving the attacks he'll be drawing.

Level 30:
Spoiler
Show

Race: Half-Orc (PHB2)
Class: Paladin (PHB)
Multiclass: Fighter (PHB)
Paragon Path: Champion of the Order (PHB)
Epic Destiny: Lorekeeper (PHB2)

Attributes:
Strength 26 (+8)
Constitution 15 (+2)
Dexteritry 15 (+2)
Intelligence 10 (+0)
Wisdom 24 (+7)
Charisma 12 (+1)

Defenses
AC 48-->10(base)+14(plate)+2(shield)+6(enchantment)+15(le vel)+1(especialisation)
Fortitude 45-->10(base)+1(class)+8(Strength)+6(enchantment)+3(Im proved Defenses)+15(level)+2(item)
Reflex 43-->10(base)+1(class)+2(shield)+2(Dexteritry)+6(encha ntment)+3(Improved Defenses)+15(level)+4(Epic Reflexes)
Will 44-->10(base)+1(class)+7(Wisdom)+6(enchantment)+3(Impr oved Defenses)+15(level)+2(item)

Feats
L1-Blessed Strength (D386)
L2-Mighty Challenge (DP)
L4-Mark of Storm (EPG)
L6-Bitter Challenge (D380)
L8-World Serpent's Grasp (HotFK)
L10-Battle Awareness (MP)
L11-Divine Protector Expertise (D402)
L12-Battering Shield (PHB3)
L14-Improved Defenses (HotFL)
L16-Armor Especialisation (Plate) (PHB)
L18-Hindering Shield (D385)
L20-Toughness (PHB) (retrained to Overwhelming Impact (MP2) at level 21)
L21-Weakening Challenge (D378)
L22-Crusading Wrath (DP)
L24-Virtuous Recovery (DP)
L26-Strength Through Challenge (D387)
L28-Honored Foe (DP)
L30-Epic Reflexes (PHB2)

At-Will
L1-Holy Strike (PHB)
L1-Ardent Strike (DP)

Encounter
L11-Certain Justice (PHB)
L13-Castigating Strike (DP)
L23-Champion's Call (DP)
L27-Stunning Smite (PHB)

Daily
L19-Wheel of Fate (DP)
L20-Rule of Order (PHB)
L25-Exalted Retribution (PHB)
L29-Discipline the Unruly (DP)

Utilites
L2-Virtue (DP)
L6-Call of Challenge (DP)
L10-Deliverance of Faith (D385)
L12-None Shall Pass (PHB)
L16-Divine Aegis (DP)
L22-Shield of Discipline (DP)
L26-True Name (PHB2)

Items:
+6 Lightning Warhammer
+6 Dwarven Godplate Armor
+6 Symbol of the Champion's Code
+6 Amulet of Mental Might
Circlet of Arkhosia (epic tier)
Ring of Free Time
Rushing Cleats
Eye of Awareness
Shadow Band
Diamond Cinture (paragon tier)
Battle Standard of the Hungry Blade
Strikebacks
Backlash Tattoo
Eberron Shard of Lightning (epic tier)
Bracers of Mental Might (heroic tier)


So, let's check a few things - our mark punishment and the DPR our enemies take.

Our mark punishment:
-enemy is already slowed and weakened versus anyone that is not us
-on a hit: prone, slide 3, daze, suffer a good amount of damage
-if demon or elemental: 2d6 extra radiant damage

Our own ability to survive:

Spoiler: Calculations
Show

Monster DPR:
+level+5 vs AC, 4d8+10 damage on a hit, 6d6+42 damage on a crit

35 vs AC, 28 damage on a hit, 63 damage on a crit

AC: 48+2(Divine Aegis)+2(Shadow Band)=52

Resist all: 5(Strength Through Challenge)+5(Ring of Free Time)+7(THP from Honored Foe)=17

1-0.05(48-35-1)=1-0.05*12=1-0.6=0.4

28*0.35+0.05*63=9,8+3,15

Monster DPR vs Us: 12,95

1-0.05(52-35-1)=1-0.05(16)=1-0.8=0.2

28-17=11

63-17=46

11*0,2+0,05*46=2,2+2,3=4,5

Monster DPR vs Us: 4,5


So, after that, I believe this is a very good defender.

Remember, his punishment through his Divine Challenge allows him to reduce shift+charge effects, since the guy is both weakened and slowed while suffering a good deal of damage.