Jondor_Battlehammer said:
You could go with Sure Striking. That would let you hurt any +5/magic DR creature, and give you +9 slots to work with. Also, have the sword made of either adamantin, silver, or cold iron. That would allow it to bypass two forms of DR on the same weapon. My money would be on silver being the more useful of the three.
Nope, You only have +8 "slots" to work with, as the weapon must be at least +1 to be enchanted in the first place.
Secondly, without access to the 3.5E rules, I'd hazard a guess and go for adamantine as the most useful. Because it increases the resistance to breakage, and it functions to a degree in AMF.
So assuming +1 Adamantine Sure Striking Katana, what else can I add to it?
As a spereate attack, to gain more attacks per round you can't beat Dancing!:
Bodyfeeder from PsiHB (+2) gain damage in temp hp.
Dancing (+4)
Corrosive (+1) from MoF (+1d6 Acid)
Ghost Touch (+1)
For your off-hand you want
+5 Katana
Parrying (+1), PsiHB (+1 to insight bonus AC, always)
Defending (+1) DMG
Elemental Aura (+3) MoF (choose once per round which element)
Probably in a different material. Cold Iron or Silver. Perhaps replace Elemental Aura with Ghost Touch and Holy (for those pesky Outsiders)
For your main hand perhaps a:
+5 Katana
Brilliant Energy (+4) DMG
Charged (+1) PsiHB (+1d4 extra damage per round Psionic energy, ignores all elemental resistances)
These three weapons give you a lot of choices, as to tactical disposition. OF course they'll set you back a mere 600,000 gp for all three...
I'll hazard a guess and say sure striking only penetrates magic DR. I feel fairly confident about this.