The New Blood

Str = 16 (10 pts)
17 at 4th lvl, 18 at 8th, 19 at 12th, 20 at 16th, 21 at 20th

Dex = 14 (6 pts)
Con = 12 (4 pts) (14 - 6 pts in 32 point build)
Int = 14 (6 pts)
Wis = 10 (2 pts)
Cha = 8 (0 pts) (10 - 2 pts in 32 point build)

1- Luck of Heroes
1F - Dodge
1H - Lightning Reflexes
2F - Weapon Focus (Slashing)
3 - Iron Will
4F - Weapon Specialization (Slashing)
6 - Toughness
6F - Improved Shield Bash
8F - Improved Critical (Slashing)
9 - Skill Focus: Intimidate
10F - Combat Expertise
12 - Toughness
12F - Greater Weapon Spec. (Slashing)
14F - Shield Mastery
15 - Toughness
16F - Power Attack
18 - Toughness
18F - Improved Shield Mastery
20F - Greater Weapon Focus (Slashing)

not the exact order I picked things up in but a rough idea

is your char human? if so i recommend picking up the least dragonmark of the sentinel. it gives you +2 intimidate and 3 shield of faith casts a day. the shield of faith can be dispelled, yes, but for quests where that doesn't happen (read as "in most quests") you can save an equipment slot that way as you don't need a protection item. it also opens up a an enhancment for +1 intimidate for 1 action point. so if you don't want to switch out anything else then throw out skill focus: intimidate. what that nets you is 3 shield of faith casts for 1 AP.

if you already got combat expertise i'd also take improved trip. a mob that is sitting on it's ass doesn't hurt anyone either. and it works also, or rather especially, with caster mobs where your AC is useless.
for the same reason i'd consider stunning blow.
you could throw out one or the other toughness or the greater weapon spec/focus for those 2 feats.

and you might consider bullheaded, it's +2 intimi and +1 will save. will save is more important than reflex for you. so you can switch it out for lightning reflexes. another save feat that's better than lighning reflexes is luck of heroes (+1 to all saves)

As I said in game, I'd consider getting khopesh and swapping out some of the shield related feats and some of the Toughnesses, while making sure you have more than 500 hp at cap at the least, including a +45 hp Shroud item and a Greater False Life item.

I've never played a ful-fledged tank and can't speak from my own experience, but you could have a look at this build, a European player who's been tanking since game launch and definitely knows what he's talking about. I'm not suggesting you should copy that build of course. It might give you some ideas though.