1. Single r99 +4 haste 300 for pve+pvp+oly
2. r99 +4 dmg 300 dual for pve and s80 {pvp} for pvp+oly (may with a sigil,saw some use single+sigil,dunno why...)
guess r99 single is good for all (balanced)
but on other side r99 dual in pve and s80(pvp) in pvp work bether in their different situations
+4 R95 2SA 300 seems to offer the best "bang for the buck" at the moment. More pvp damage than any of the weapons you mentioned. And almost as much pve dps as r99.
I often see them for around 2B, these days. Sometimes even close to 1B.
At the time of this post +4 R95 2SA 300 dual dagger 1.9B, Single 1.2B. Naia AH.
R99 is a dead end anyway. Astronomical price for 2nd SA and augmentation. Unless you have 30 Bills to buy Dark Amaranthine, don't even bother.
You can of course always go the S80 route, try to get high OE for soulshot damage + passive duel might.. but that is a road of uncertainty.