Quote
My protein shake lunch suddenly feels very inadequate.

Beverly International's Ultimate Muscle Protein. 80% Casein 20% Whey. Tastes better mixed with room temp tap water than GNC's did with cold milk, PB and chocolate syrup.
http://www.beverlyinternational.net/productpdfs/Ultimate_Muscle_Protein.pdf
The best price I have found is at VitaGlo, free CONUS shipping over $50 and they ship overseas, my buddy in Okinawa gets it from them.
http://www.vitaglo.com/beinulmupr28.html
Also check out PB2.
http://www.bellplantation.com/products
It's perfect, I dump a scoop of UMP in the bottom of my shaker bottle and another in the top with some PB2 and I'm set for the day, just add water.

Warning: I may not read all responses before replying to OP