If you're going to powergame, at least do it right. No point in wielding twin bastard swords or even a single greatsword, because at little higher levels scimitars and falchions rule the day.
Don't play fighter. Play a cleric. A dwarf cleric with the war domain gets free feats for weapon (Haela Brightaxe gets 2-h sword, sorry no falchion).
At 15th level:
Triple empowered Bull's Strength
Triple empowered Endurance
Quickened divine favor
Haste boots
Divine Power
Greater Magic weapon
+6-8 other boosts (Death Ward, Freedom of Move...)
You'll beat any fighter in melee. Really. And you've also got spells galore!
If FR is available, the same works with Archer-Cleric with the Elf domain (equal to war domain in free feats). (You'll get that triple-empowered Cat's Grace in Elf domain)
Mages aren't as interesting to munch out, since the spells are sucky compared to clerics, and the clerics are much harder to kill. (Death Ward, Spell Resistance, Spell Immunity etc...)