Definitely wait until it passes first
I've made that mistake before - blowing all my money on parts and then needing to fork out money I don't have for repairs.
As said, lowering springs or coilovers if you find them cheap are always an awesome mod.
You can fit an almera/primera/GA16 airbox (£5 from scrappy) and fit a k&n panel filter (£30). If you wanted to go even further you could install some induction piping to the front of the car.
If your car is a 1.0L a really awesome mod is the 1.3 cams. Nothing fancy, just fit CG13 cams into your CG10. Was the best mod I did to mine, not expensive either if you know how to fit them.
Another scrappy mod is GA16 injectors which are a straight fit, and if you wanted to go even further you could fit the GA16 throttle body. But you need to make a few modifications to it and it can run a bit funky sometimes.
Remove the side strips - Can be a bit tricky but there are some guides on here.
Any 4x100 alloy wheels. A lot of people run Almera GTi wheels as they're cheap, readily available and look pretty awesome.
You might get lucky one day and find a Renault Laguna front splitter. They're pretty sort after but it's understandable why - they look pretty awesome.
Bit more expensive, but if your car is a base model it's always worth fitting SR/Super S bumpers and a spoiler.
Also, a few cool stickers (touge automotive etc) always help raise the flamboyance of your car.
That's all I've got off the top of my head! Happy tuning