Double TR Half-Orc: Pure vs. 18/2 Fighter

[Hadrian]

I have an old warforged barbarian that I have not been playing much recently. Half-Orcs are finally here, and I am ready to TR him and finish his build.

A lot has changed since I first made him in mod 5, and I am now trying to weigh the options I have for a completed build. The difference in the options are basically in level split and feats taken, so I will focus this post on those differences and skip the unimportant details. In both cases I'd have similar starting stats and FB 3.

Option #1: Pure Barbarian

Feats (in no particular order):
1) THF
3) Past Life (Barb)
6)ITHF
9) IC: Slashing
12) GTHF (or stunning blow)
15) PA
18) Cleave

Also, I'll have the benefit of the capstone and the final tier of rage upgrade if I stay pure.

Option #2: 18 Barbarian/2 Fighter

Feats (in no particular order):
1) THF
3) Past Life (Barb)
6)ITHF
9) IC: Slashing
12) GTHF
15) PA
18) Cleave
Fighter 1) Stunning Blow
Fighter 2) Past Life (Paladin)

I lose the rage and capstone bonuses, but I gain +1 str from enhancements, those two extra feats, and the first level of fighter melee alacrity boost. For those who may not be familiar, the paladin past life is +3 to-hit and damage, so equivalent to a +6 strength buff for about 2:12 per use and 3/rest.

So this works out to +4 str and +2 con against +1 str +6 temporary str and a 15% melee alacrity boost. The pure option also allows me to possibly get 4 tiers of THF (4th one being in the capstone) in exchange for stunning blow, while the 18/2 option can only choose GTHF + stunning blow.

It seems that option 2 gives significantly more DPS when buffed up fully, while option 1 doesn't rely on any short term buffs. I'd say the pure barb's slightly less peak damage bonus weighed against the fact that when the buffs wear off, he's got a slightly larger advantage would put things in favor of the pure barbarian, but the 15% melee alacrity makes it a tougher choice.

I'm looking for comments from different view points, and maybe advice on something I've missed. Please comment.