ok seriously? e bay? maybe an intercooler but thats really it. IMO i would keep the ka and turbo it. start of small like using the sr injectors, piping, smic and t25 setup. if the sr has all those parts that the guy is selling id buy it because eventually youll be buying turbo part anyway. then part out the rest of the sr for funds for your build. eventually in time i would start building my motor the RIGHT WAY and give it a proper rebuild with the funds used by selling parts... ex. replacing gaskets,uprgrading turbos, giving a proper tune, fluid changes and replacing worn hoses/ belts. people give the KA a shit name because there are so many out there that just strap a huge turbo on the motor call it a day and blow the motor to kingdom come in a week...
dont get me wrong though, the sr is a great engine but if i were to buy one to use id make sure it was complete or from a shop that get clips so you can inspect it and basically get all that you need. besides its fun to buy sr front clips! sometimes they come with cool goodies! like digi climate control and tuned motors!
so if youre going to buy an sr.. save up and do it the right way. or get it from a person you trust.