Recommended IGH for 3-4kW

Haven't followed the recent products for some time now, but as i want to install a LR kit on my bike i'd like to try some IGH.

First mind is some Nexus hub. It should be good for up to 3-4kW peak, mainly around 2kW.

Mounted on a street riding bike, so no big shocks are to be expected.

What are your recommendations?

Nuvinci N171B

Just found spinning magnet's excellent sum up that says all
http://www.electricbike.com/mid-drive-kit-igh/
The 171 is not produced anymore and too bulky for me. I guess i'll keep my derailleur.