Cheep na for 3k. Some professional driving lessons. And then save the rest for when you hit "oil" and have to have it unbent from a tree.
I don't know where you are getting a single turbo conversion for an na for 5k from. You might get the turbo. Exhaust, manifold, intercooiler and misc bits but you need the fueling and ecu to go with it which could be another 2k. And if it's not a 6 speed already (rare) your going to need one. Which is 3k on it's own. And I wouldn't want to run small na jap brakes on a single... Usually people budget 10k and I don't think that includes labour.
I also. After having a 5 speed na. Uk auto bpu and 6 speed single. If I were to sell the single would go back to a bpu auto. The 6 speed is good with the single. But it's a pita in traffic. The auto is so smooth and responsive and combined with the bpu gives you a real kick in the back