Which Mac combo?

hi,
looking new mac set get. money isn't issue, because spread out purchases on 6 months. on computer lot of internet browsing, email, writing documents (not many), keep track of finances; usual.
combo think best?
1. imac (either 21.5" or 27"; not sure yet) , 15" macbook pro
2. imac , 16 gb ipad (possibly 4g)
3. 15" macbook pro external monitor
4. imac , 13" macbook air
5. mac mini dual monitors , either ipad/15" macbook pro/13" macbook air

option think best?

 

computer (imac or macbook pro depending on whether need portable or not) , ipad best combo.

no need both desktop , laptop in situation.

 

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