Am considering purchase of a new or reconditioned MBA, but judging from posts in this forum, it is pretty frustrating waiting to see whether/when MBA will be upgraded or even discontinued. At the same time there are growing numbers of alternatives w/modern hardware. Recent example is Toshiba R700 series (just released). The version at Best Buy (R705) has i3, 500GB, 4GB DDR3, a DVD-RW (!), LED backlit 13.3" screen, magnesium body, and 3 pounds light, all for $800. (But, Intel graphics, thicker - 1" - and less solid keyboard.) Anybody with comparative experience on the new rigs, or purchase advice?