Leader frames are wildly popular on the singlespeed/fixed gear forum. Internal geared hubs are popular in the commuter and recreational riding forums.

I like internal hubs for commuting as they are worry free but be prepared for a workout in Toronto with a 3-speed.

I'd just go with a standard wheelset as the AeroSpoke look will increase the chances of your bike getting stolen. They'll be cheaper, too.

Go with the North Road bars but start with them in the up position. It's better to be more upright while commuting so you can see the cagers paying more attention to their cellphones than where they are driving. Also better if you happen to be wearing a backpack or messenger bag.