[quote name='Bizzquik']Thanks for the replies, guys.
So if downloading time was no concern, then I can basically just use the Steam activation key to let Steam download the game and never even bother with the actual disc? I like that! (Yes, I know it makes little sense, but I like letting Steam do everything for me.)[/QUOTE]
Correct.
I don't know, but it depends on how fast you download speeds are.
For me, Fallout: New Vegas + 4 major DLC's takes up almost 10 GB. I'm only the missing 2 weapon packs.
Personally, I'd rather be installing from the disc(s) namely on big sized games like RAGE (24 GB).