help peeps...we're finally moving to a new home and would set up my internet tomorrow (so i need help asap.herherhehr)

the house has a main floor, 3 bedrooms and a big basement...

so what wireless router do i need? i need something basic that can go through drywalls with ease....

do i need a range expander(?) or booster?

wireless G? wireless N? do i need them?

im looking at second hand items in craigslist.org but im willing to cinsider brand new ones too (limited budget)..herhehrer

thanks!

EDIT: my laptop's specs says....802.11 a/b/g ...so does it mean i cant use an N?