Melee FvS question

[WruntJunior]

Planning out my final life on Youngwrunt (TRing just to get up to 36-point build), I've been thinking about whether or not it's worth picking up /2 fighter instead of staying pure. The difference would be up to 3 feats (as I would be able to go human rather than going half-elf for fighter dilly) so that I can pick up the overwhelming critical line (already have full THF line), or I could go half-orc and, while having more trouble getting the OC line and less healing amp, I would get greater THF damage. However, this higher damage comes at a trade-off of survivability in the loss of 10 dr and free clw.

Part of this consideration is the fact that I'm working towards Legendary Dreadnought now, and am considering the momentum swing line.

The healing part is easy with this character...my main question is people's opinion on which build of 3 would be best for DPS purposes:

20 FvS Half-Elf (fighter dilly for martial proficiency)
18 FvS/2 Fighter Human (all feats of half-elf + cleave/great cleave/overwhelming critical)
18 FvS/2 Fighter Half-Orc (all feats of half-elf - empower + cleave/great cleave/overwhelming critical)

For reference, 20 FvS has the feats Empower, Maximize, Quicken, Toughness, Improved Critical: Slashing, THF, ITHF, GTHF, and Power Attack.

As a further thought, /2 monk is a possible choice.

Edit: Making a level 24 cloak of night in case I decide a splash build is best and still want the 10 DR. I'm spoiled on my DR. >_>

Second edit: Currently leaning toward 18 FvS/2 Fighter Half-Orc.

Third Edit: Build I chose in post #3: 18 FvS/2 Fighter Human.