Remus If I can give you some advice, by all means get the nexis, smoke it round for a year or 2 and get some no claims under your belt, leave it standard, then buy somthing when your older and wiser and can insure it.
Putting a Peco big bore 4 or somthing on a daewoo is just what you normal mcdonald chavtastic racers like doing, and most people here frown on that sorta stuff, its only cus we are old farts who look at people in these cars and think omg.
Its up to you what you do with your car, but people are trying to point you in the right direction from the beginning, but if you still choose to go this route, you will just spiral into a world of whale tails and stick on body kits.
We will help you, but try and make it tastefull, and think first.
Ronny