Look, I don’t drive a turbo car, but if I were in your position, I would talk to some of the N/A-Turbo guys on here, and I bet you’ll find that unless you know what you’re doing and can do work yourself, going turbo is never really cheap and it’s anything but easy.
The bottom line is you ask a lot of questions like this (not that it’s a bad thing). It seems like you are relatively new to this and you probably aren’t in a position to do much work yourself. If you want to learn to do the work, that’s great, but until you’re at that point, or at least ready to learn by doing on a car that’s not your daily driver, I think a project like you’re describing is asking for it. You will throw money at getting your turbo setup right until you hate everything about your car, and you stand a good chance of blowing it up or being left with a half-finished project that no one wants and you can’t get your money back out of.
My personal recommendation: Learn to do this on something where you can accept plenty of downtime. If you have money for a Greddy kit, you have money to buy a cheap shell and start building.