Toshiba's thin-but-full-powered Portege R700 was such a hit among business types that the company is now designing other machines in its svelte image. Tosh just unveiled the Tecra R840 and R850 -- both of which ape the R700's slim build -- along with the Portege R830, a refresh to the R700 itself. The R830 looks the same, though it has a strip on the edge of the lid that looks like it's made of magnesium alloy, but is actually plastic -- a material that's expected to improve the signals of the the various antennae housed underneath it. And -- surprise, surprise -- this refresh adds a USB 3.0 port and Intel Sandy Bridgeprocessor, which the company says should bump the rated battery life to a max of 11 hours, up from eight. Not the corporate type? The company will also sell an $889 consumer version, the R835, that has a one-, not three-year, warranty, and loses enterprise-grade features -- namely, Intel's vPro technology, a docking connector, and an ExpressCard slot....