Canon 17-55mm f/2.8 STM equivalent?

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I'm currently looking to upgrade to a Canon 70D and my current go to lens is a Canon 17-55mm f/2.8.

I take a fair amount of photos inside, and with our wonderful British sunshine the fast lens really helps for outside shots and also gives a nice DOF.
The problem is that I also want to shoot video, and the lens is just going to be too noisy when auto focussing in video.

Is there a lens anyone can recommend that is an STM lens which will produce the same results as the 17-5mm? I can probably spend around £350
It seems that the only STM lens at f/2.8 is the 40mm pancake?
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