Best image or best focusing? DxO has a great comparison chart with all the pluses and minuses for each. 5dII pops up quite a bit among the more expensive 1d-series bodies.
Which lens depends on what ya like to shot the most. The latest 70-200 2.8 gets great reviews and should cover a wide gamut of uses and still let you use teleconverters for more distance if needed (which is always).