My decision was made for me at 1a.m. today. I sold my copy of the 24-105mm f/4L IS USM. So now I have to buy a 5D mkii with the corresponding 24-105mm kit lens. That should leave me enough cash to buy a 135mm f/2 and then I'll be down to zero dollars. So that's a plus.
Glad you made a decision, though I wonder why you didn't keep your copy of the original 24-105mm IS USM, and just get a 5DmkII body only? (wouldn't that have been cheaper, than buying a new 24-105 IS USM?)
Before reading your last post (quoted above) - I would've recommended the 70-300mm L, which is a great lens - giving more reach than the 70-200mm's (obviously) and being very sharp and great IQ / contrast (almost at the same level as the 70-200mm f/2.8 II).
Also, I can also endorse the Nissin Di866 MkII as a great professional, yet not-too-expensive flash... works very well for me on my Canon DSLRs!
All the best with your new kit - and the 135mm f/2 is a great lens!