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MavenI'd say weight reduction is one of the first modifications for me, at least the first two levels. Tires are important but often too expensive (I don't like to rack up huge amounts of money). Next would be the racing chip for extra power, although I have no idea why you would be able to buy one for cars that don't have computers!!! So I don't.
I have never, and never will, use NOS.
never use a NOS you say, it could substituts for other mods if you like a challenge.
for examplae, entereing a hard challege with a slightly underpowered car, use NOS to push you through a bit then skill through turns. its an interesting combo but this will arise a lot of comment and i can't be bothered.