A few thoughts:
Blackhawks - The updated logo doesn't really mesh with the jersey design, so keeping the old one is the best decision here (also love the five stripes)
Islanders - The backside of those throwbacks has never been done cleanly before in a concept to my knowledge, so I was quite pleasantly surprised when I saw yours
Canucks - The tweaks on stick-in-the-rink logo are very nice, love how you incorporated more green
Blues - The lighter blue is surprisingly amazing.