So far on my S14 I have put on a Vis Racing Sports carbon fiber OEM-style hood and ADR wheels with Kumho Ecsta tires all around. Next up are some go fast goods.
The quality of the Vis hood is great. It's a lot lighter than the stock steel hood and fits pretty well. Hood pins will be put on soon to keep it under control.
For some good looks and better handling I installed some ADR racing rims and Kumho tires. I got the wheels off of eBay in mint condition, and I bought the grippy tires when I got them. The car sits, looks, and handles much better now thanks to these.