Well Debain is very good distro, but has that one problem i experienced few times: i mixed repositories, resulting in fatal crashes (first time i did it when Mumble 1.2 came out) so i tried stable, testing and unstabile versions, all ended up in same fatal crash... But they did last for some times, year or two. Good thing is that most of problems are laready fixed (you can finde them on forums) so you don't have to wait for replies.
However, I find that Mint Debian is almost as stabile as Debian, but is easier for instalation: i always did it right from first try, unlike with Debian (maybe it was because of experience, who knows), and yes it has live DVD. Good thing with it as well is taht i comes with most things you will need: good multimedia support, easier to install GPU drivers, and basiaclly all you need (at least what i, average user needed). Debian comes with much less things. But sill, unlike Ubuntu (or even Mint Ubuntu) it doesn't have 1000 "fancy" things you'll never use. Only thing that you might not like is MintMenu, which can be disabled easily.
Anyway, if you go on Debian or Mint Debian, folow this rule: "Don't update if everything works." I usually don't update them at all, sometimes i update when there is like 1GB or updates.
And note that if you go on Linux, you might need to install it few times, because youre bound to fail first time
. At least they install fast when you know what you're doing.