I dont know how much you need to spend to get them but heres them in order:
1.Nook`s Cranny(regular)
2.Nook`n`Go(more items)
3.Nookway(more items/bigger)
4.Nookingtons(extra floor+tommy and timmy nook)
Her house does not exist at this time in any Animal Crossing game .
You can't. Resetti's house is only in Animal Crossing City Folk.
No, but Animal Crossing: Wild World you can get a AR DSi and get infinte bells.
Nope.
Ya! Your house in animal crossing wild world can hold 4 pepole!!
No you cant
buy a house
no, it can only get bigger
No.
A mansion.
No. Same apply to all Animal Crossing games and Pets outside of the house and cage (tank).
no you can't just like you cant get a nrmal house