I wonder how much an in hilt charger would cost on a warrior edition?
In hilt recharge comes standard on the warrior tier Bane because the way the hilt is assembled would make accessing a removable battery a hassle, and so it costs $16 more than the other Elite warrior tier sabers. So if I had to guess, adding that to another warrior saber would be at least $16 (part of that probably is due to needing the more expensive charger).
I personally can't decide if sound is worth it for the whole experience, or if I should go with a hilt I know I'll be 100% satisfied with.
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While sound (as well as the blade flicker effect the soundboard also controls) really does complete the package, I think getting the hilt you really like is far more important. Sound can always be added on later, either by sending it back in, ordering a champion tier electronics kit when ASP launches, or even installing it yourself with another brand of soundboard. There are a TON of different soundboards designed specifically for lightsabers out there, all with varying amounts of features and price levels.
Though whatever you decide, definitely go with the 12w.