If you plan on going the chainsaw route check out Logosol.
www.logosol.com The Logosol Timberjig will do an admirable job of squaring up timbers (or ripping simple bladed scarf joints), and it's hard to argue with a $165 sawmill (chainsaw not included). Their M7 sawmills will give you more control(specialty cuts etc.) than a traditional bandsaw mill for far less money.
