HERE IS MY CHARACTER PLAN:

Barbarians get 12 HP per lvl. Fighters get 10.
That's 2 more HP per level. 2*20=40.
The Toughness feat gives 22 HP for level 20s.
So 2 Toughness outweighs going Barbarian.
20ftr gives 18 feats. (11 class, 7 regular)
Barbarians need Cleave to Frenzy! Waste..

20ftr ThF Kensai Barb-style Human (easily healed)

STR
18base +6item +3enhancements +5leveling +2tome =34
(7 more available via human enhancement, +7item, +4tome,

+3 exceptional)

CON
18base +6item +2tome =26
(7 more available via human enhancement, +7item, +4tome,

+3 exceptional)

Pros:
Kensai Enhancements
Powersurge (+8str ability)
+1 Crit Range from Kensai 3.
More HP & Feats.
30% Haste Boost.
10% Doublestrike chance.
No rage-deaths lol!

CLASS FEATS (not in order!)
1) Two Handed Fighting
2) Improved Two Handed Fighting
3) Greater Two Handed Fighting
4) Power Attack
5) Quick Draw
6) Improved Critical: Slashing
7) Weapon Specialization
8) Greater Weapon Specialization
9) Weapon Focus
10) Greater Weapon Focus
11) Superior Weapon Focus

REGULAR FEATS +1 Human
8 Toughness