[Molasar]

personally I'd be looking to futureproof by getting a tablet with a clip-on keyboard - best example I can think of is ASUS transformer devices where the KB has a battery that (very simply) doubles the battery life of the tablet.
you'd need to check that the device has USB ports for eg. external drives, and other plugs for the sort of stuff you take for granted on a desktop PC.
depends what you want the new 'pooter to do.
for most of us at home a standard PC is vastly over-specced with unwanted features which you'll never use when all you're doing is a bit of WP, interwebz, and pissing about with your photo and music libraries.

that's how it looks to me, others who do gaming or use it for work will say otherwise, them needing all (or at least some) of those bells and whistles.