You do want to work you melee weapons up from time to time. Never know when they will come into use for those up close and personable moments

I never go to 2 handers. That extra armor your shield gives you is definitely needed for those melee players.
My one two punch is Lightning Bolt/Fire Shock or Chain Lightning/Fire Shock or Chain Lightning/Lightning Bolt/Fire shock. You can see that Fire Shock is my finishing cast.

Many will tell you they use Earth Shock. ES does not stack like Fire Shock does. Magma Totem pulses, so I use this again for melee players. Especially when they cant see 5 totems pulsing mega damage.

My favorite is Fire Nova(5) then Magma(5) after the Nova goes off.