turbo setup

I have been on here looking at the turbo setups. I have also looked at the thread "Turbocharging Explained" but things are not adding up. On tearstones thread it as this the drawing of a turbo setup. It has the compressed air from the turbo going through the intercooler, then into the engine...

okay, im looking to build my own turbo set up. im only looking for about 275 to the wheels. using an emanage to tune. but i dont know what turbo i should use. All of the precision turbos are like $900 and im not trying to spend that much on the turbo. I know that people use big turbo that are a...