I would choose choice #1 because that's what I did and happy with it. Then choice #3 for 2nd choice if the 1st one doesn't work out. The reason choice #2 doesn't work that well for me is because you might never know when you need a Mac on the road.1. iMac/ Macbook combo.
(This could actually be useful as I carry around a laptop alot and when I need power, I can resort to the iMac)
2. High End iMac
(I have a 15in HP dv6000 when I need to be mobile)
3. 15in Macbook Pro with 23in ACD.
I hope I helped.