1 and 2 were never sold on Steam, but always given as part of the bundles, now they are completely gone. Much prefer the ability to download them through Steam.
GTA IV does hav a decent story line. There aren't tanks like there are in III, but you can fly a helicopter with guns and missles if I remeber correctly.Is GTA4 worth the $10?
I played it at a buddies house ages ago and it seemed like a boring rehash of all the previous games.