h: Key Research: Barcap upgrades UNP & downgrades NSC, GS downgrades WMS (sell), UBS downgrades Brean Murray downgrades HOGS, Jefferies downgrades XCO/DLR & upgrades AMD CLSA upgrades Toshiba (6502 JP) (buy), JMP upgrades NUVA, Raja downgrades UAM CS initiates SYK/ZMH (op's), Piper initiates SPNC/GTIV (