Given that the latest 24-70 is the Mk II, I doubt they'd still be manufacturing the Mk I. That's not to say you can't buy one, but your question was "are they still making them?"
There's a noticeable difference at the wide end between 17mm and 24mm. If you're often shooting in that 17-24mm range, I'd stay with the 17-55. If you're more using the mid to long end of the 17-55, 24-70 would be fine. Beware, it's heavier than the 17-55. Nicknamed "The Brick".
I haven't had or used the 24-105, but know there are plenty of guys here who have and swear by it. Gives more reach at the long end, but slower at f/4 instead of f/2.8. But the 24-105 has IS, the 24-70 doesn't.
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