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Most has already been said. Go for same type of tires all around, it will not increase understeer above that of already understeer biased stock alignment, and will also allow to rotate tires front to rear to even out wear and get more out of set and simplify changing all tires at same time. My friend, whose car has stock staggered sizing says it's PITA. Our cars luckily have square tire sizing, see no reasons to willingly introduce handling issues/complify replacement/reducing how much you can get out of set/loosing ability to rotate/reducing tire choice .. by paying own money for that.
Only advise on top of that would be to never use foam tire repair kit some twins come with, only spacesaver tire, as after that kit usage most tire shops will refuse to repair tire, so you loose cheap repair option and possibly may need to buy pair of tires, if wear level differs by much. And again, yet another con for if staggered tire choice, as spacesaver cannot be used on rear axle (due it having LSD diff), so in case of punctured rear you cannot simply relocate one of front tires (normally of same size/type) to rear and spacesaver in front, you have to do double the work to put both fronts on rear for them to match in rear.
In short, don't go staggered. There are only cons, handling problems, inconveniences and extra spendings, with only "gain" fooling ofself by false misconception that if it's staggered like in some supercars (forgetting, that they/their suspension/brakes and alike, have been designed around staggered) then it's "better". Each car is designed as a system. Putting F1 wing on dumpster track won't net you anything (though silliness of example aside, at least only con will be misspent money, unlike with staggered tire choice).
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