Doc Fluty wrote in post #9585349...my type of shooting is mostly of my daughter indoors and outdoors... and landscapes
sounds to be the perfect camera for you...
The 5D Mark II has amazing things to offer like HIGH IQ, impressive ISO/noise ratios, and shallower depth of field. Though it only has a center point cross-type f2.8 af sensor, it definitely holds it on out in the field.
The 5d mark II definitely requires top glass to bring out it's amazing strengths... i personally found that the 70-200mm f2.8 performed better on the 5D Mark II as oppose to the 40D, but still, it didn't meet my HIGH standards, so i sold it for an 85L and 135L which i'm definitely happy with. When the 70-200 II hits the store, i will sell off 135L for the 70-200 II. All i needed was a much better long end with more sharpness that it offered. I miss the flexibility the 70-200 offered and the IS system it carried with it.
Oh and you'll miss your 17-55 thats for sure! there's not a full equiv out there for FF yet - we are all crossing fingers for a 24-70L II (or at least something with IS).
for walk around lenses, don't exclude primes as they offer HIGH IQ, flexibility in aperture, and a lightweight design. Think about a 24L II + a 50 f1.4 (or if you have cash and room in your bag to spare, the 50L would be nice) - something i'm adding onto my kit within this year or next. You can also get the 35L which does nicely as a compromise between 24mm and 50mm. Just step forwards and backwards to get those FOVs. the only reason why i want a 24L and a 50L is because the 24mm makes for a great lens when me and my girlfriend go out for dinners. the 50L is perfect for close portraits/walk around.