short answer, v1 is a great lens, get it used or new or white box and you'll enjoy it, no budget issues v2 all the way.
Seems like you have a pretty good range of focal lengths with your current equipment. I have the V1 and love it, if i had the coin I would get V2 in a minute, the good thing my V1 has great value and when i have some extra coin i can sell and get a v2. Personally I would grab a V1 used if i was on a budget, if not V2. Im actually really interested in the new Tamron when more info comes out, i have never really liked tamron, i always had sigma, when i got extra money i got canon but recently borrowed a sigma 70-200mm 2.8 and fell in love. reminding me you can find great value in 3rd party vendors. I have the 7d, i went from the old sigma 24-70 which was great, to the 24-70mm v1 but it sits off my camera because i got the canon 17-55mm f/2.8 and love it. With my 5dmk3 on the way the 24-70mm will be back off my shelf and in action. Selling the 7d, 17-55mm but still have some simgas that will work great on the new camera.
I have no clue when this is set to launch but seems promising.
Tamron develops full-size, high-speed standard zoom with built-in image stabilization – SP 24-70mm F/2.8 Di VC USD (Model A007)
Either way you'll be happy, i always find pros and cons in a new lens. I love places like this to post and ask other users, but unfortunately i find reviews online are very strict, copies vary, and people expect to much from different products. I find always better to take all infer and reviews with a grain of salt, if possible go to a good local store, and ask if you can use a 24-70mm v1 and v2 bring your camera and take sample shots in the store. I actually bring a friend, niece, nephew, wife, etc to have some subjects. Good thing about that is you can ask the salesperson to not sell the copy they let you try incase you love it you know you can get that copy. Or if you don't have access rent one and see what you think.