Congrats, that will be an awesome trip.  I love Burt Lake for the nice site there and clear water.  Marj and Joyce are the same.  Joyce is a lake I've always wanted to get back to.  It's rumored to have blue walleye.  There's a nice site on the island group closest to the Kahsh portages.  It has an open area in the back with a very large white pine right near a very large red pine.  Two sentinals that survived the years.  There's also an old gas can from the 60's 0r 70's in the area. 

Have fun and do a trip report please!