Dude, you start a KA vs SR thread to help you pick your engine and now you want to know what turbo to choose for your KA-T. You trying to to build your car by committee or something? This isn't 5 years ago, where application specific information in regards to the 240sx was relatively rare, this is 2007 and with rare exception if it can be done it has been done, with pictures and dynos available online. If you don't start learning about making power it's not going to end well for your car. You need to start educating yourself(search, lurk moar), start riding/driving in people's cars, learn what *you* want and stop asking other people what you should do.
Is it your car or ours?