I've used the NRS Storm boots for the past two years.  I had to have a local cobbler reinforce some stitching for me (at the top of the ankle, simply stitching the outer shell to the liner better than it came from NRS) before I took off.  I spent a lot of time in the BWCAW and QPP last year and used these boots for all but the very early and late season trips.  I found them to be very supportive, drain well and have good traction.  I wore a silk or polypro liner sock with them (makes them a lot easier to get on and off).  At the end of the season, I had a tear near one toe (from snagging on a root--taking a header with a full pack and canoe).  Over all I like them a lot.  At the end of a long day, though, taking them off is a treat.  Sandles never felt so good.  I never overheated in them, simply because they were always wet.  I use a Superfeet insert inside them to give me better support and cushion.  Works well.  
I know the portage boot question always draws a lot of responses.  I wonder how many times a similar thread has occurred on this forum...
On another note:  I use the Chota breathable mukluks for early and late season.  I have had a lot of problems with them (stitching tearing out and general construction issues) and resoled them after less than a month's total time in the parks (check out Aqua Stealth as a material for resoling--best grip I have ever had).  All that being said, they are still my choice for cold weather paddling/portaging.  Far from perfect, but best I've used so far (though that's not saying much).
Cheers,
gp