Why would you want to gear thief for savage blade when you could gear it for rudra's storm instead? If you already have Naegeling and no relevant daggers I can understand the temptation to carry it over, but our sword skill is just too low. You're looking at a difference of 83 skill, and that's really going to hurt your numbers. Thief should be using daggers, and I have little doubt a kaja knife would outperform a naegeling, let alone the upgraded tauret. The gear sets you'd be using for savage blade would overlap with your evisceration and/or rudra's storm sets too. Basically, whatever you built for with a sword would perform better with a dagger in your main hand instead. Don't get me wrong, naegeling is a great weapon, and savage blade is incredibly powerful. But so is tauret, and so is rudra's storm, and with Tauret mainhand evisceration is too.
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Useful for NMs that take reduced piercing damage or only slashing damage.
Valid argument, however niche it may be. For the purpose of brevity the above gear set looks pretty good, but I'd recommend grunfeld rope for the waist slot instead of Prosilio +1. Mainly due to the aforementioned discrepency between dagger skill versus sword skill. You'll probably want the accuracy more than the multi attack, and the secondary mods go well with savage blade. Situational gearing aside though, dagger should still be your primary weapon on thief.