I am surprised by your advices :
My favorite dip right now is rogue 4. You get evasion, access to a huge skillset, and uncanny dodge. Uncanny dodge works on RoT, so its a pretty nice way to compensate for lack of immunity to critical hits. Evasion permits you to take expose weakness(auto-hit bug), and the feat itself is nice.
->>> there are many random drops with improved evasion, including rings, (update : now there is one in stonakor shop), so rogue is useless except if it gives access to a very special rogue item useful for warriors, which I yet have to find.
So with that in mind, I'd say that the levels of fighter that you'd most likely want to aim for is fighter 14. You get +6 STR thanks to the Epic Stoicism which is available only to fighter 13+ characters at the shard processor(details here).
->>> yes of course my target for STR is 32, so +6 with epic stoicism and +12 item I will reach the 50 cap.
->>> why Fighter 14 ? 13 is minimum for stoicism, but 18 is needed for Weapon supremacy. useless feat ? It may count agaisnt AB cap, but I am far from +20. +13 form weapon, +1 tacticain feat, and... what ?
So that's 18 levels of down.
Warrior of darkness or anointed knight are great classes for many reasons. The obvious one is the spell protections that the class provides; high will and spell resistance. I greatly recommend it for "straight-ish" fighters. 10 Levels of that then...
->>> Being Yuan ti removes the need for these lines of class. Immediate SR.
Frenzied Bezerker 2 for increased attacks: The problem with Power Attack and WM's is that there are so many ways that things can go wrong that its usually not really worth the investment. So for more damage, capitalize on the number of attacks; which is how most powerbuilders go about on here. FB 2 is easy to squeeze into the build in pre-Epic as well in this case.
->>> in the description it is said that FB increased attack is not stacked with haste. As Haste is available since char level 2, what is the point of those FB levels ?
Well, that does not mean I have better ideas !!
So far my build :
30 : Fighter 18, WM 7, COTW 2, Elite commando slayer 3
I reach final 50 STR at ER2+Epic soicism
40 : Fighter 26, WM 7, COTW 2, Elite commando slayer 5
But...I am sure beter ideas are aournd !!