Thanks for all the opinions. Like you guys, I was also leaning towards the 24-70, but my main issue with it is the lack of IS. I have heard rumors over the last year about a new 24-70, how it "might" have IS, or how the images will be nicer. Either way, it's been a rumor for the last year (or 2), and when it does come out, I would think it would be $$$$.
Given the history of existing lens, I haven't really seen older lens decrease in value when a new one comes out (ie the 70-200 have retained its value even though Canon has release newer version like the IS2). It seems like the trend is that they make the new glass more expensive. But hey, that might just be my perception.