belta is the cheapest sedan.
but u can get a hatch back for a lesser price.
Vitz is going arround 2.1 to 2.8
Passo is 1.8 to 2.4
Both are good decent cars.
Google these two for more info.
and If you can afford a Belta, I suggest extend ur budget a bit and go for a Prius. Cuz Hybrid is...