Well, there's also crescent knives from dragon 275, a way to flurry with those via Unorthodox Flurry from Dragon 279, plus your TWF change, and then Sakkratar's Triple Strike.
The build might go Monk1/ Swash19 and get 16d6 just from swashbuckler, then Assassin's Stance for another 2d6. Four base attacks, plus one for flurry, plus two for STS, which is seven attacks, doubled for TWF, doubled again for crescent knives. 28 x 18d6 = 504d6, which averages 1764 damage.
Actually, now that I look at it I suppose that's rather tame compared to the best ubercharger build, or of course a hulking hurler. I know Soro got the former to 6,000+ damage or so. Where's a "zip my mouth" icon when I need it? lol