Re Blackhawks
Unfortunately, Tim Sassone passed away last March - so he can be removed from the list.
Mark Lazerus (@MarkLazerus), the beat writer from the Chicago Sun Times should be added.
Brian Hedger (@BrianHedger), the Hawks writer for NHL.com should be added.
The twitter account you have for Scott Powers (@ESPNChiHawks) is the ESPN account for the Hawks he runs. Powers also has he own account (@ESPNChiPowers) - he typically tweets to both accounts simultaneously, but it might be worthwhile adding is own account.
You have Tracy Myers, the CSN writer for the Hawks - but CSN also has an additional Blackhawks account (@CSNBlackhawks)
The other CSN writer for the Blackhawks is Nina Falcone (@NinaFalcone) - although Myers is the one who typically 'breaks' things re CSN - so Nina may be redundant
Al Cimaglia (@AlCimaglia) does Blackhawks for NHL radio.
edit - i don't know if you want to add him or not - but Eric Lear (@BHTVeric) is the active online reporter for Blackhawks TV.