lynthorpe, have you checked out
GOG yet as Draclvr suggested? Their games are DRM free, you can download from your very own online shelf and play them, burn them to disk and keep them on your shelf at home if you want. And you often get extras with them like manuals, avatars and soundtracks.
They've got all the Gabriel Knight games, Revolution's Broken Sword, the Director's Cut (which also comes with the original game), Broken Sword 2, both the Syberias, five Tex Murphy games, Beneath a Steel Sky (free), The Longest Journey and a bunch of others. The only one I've had any trouble with was Dragonsphere and a minor fix cleared that right up.
One of these days, we're hoping they'll add Lucas Arts games but, sigh, no luck yet.
Oh, and they're
cheap.
Gil.