Xenon headlights are a pretty expensive upgrade. The standard halogen headlights are poor by comparison, but that doesn't mean they can't be lived with.
- For some people the colour of the light emitted by xenons is an important 'car fashion' choice, but that may or may not be a fashion you are concerned with.
- If you do a lot of driving on unlit roads at night, then xenons can be worthwhile but in built-up areas (ie, with street lighting) they aren't that valuable.
Don't consider the windbreaker as optional - if you have a convertible, it's a must-have. Drop something else if you have to.