Few questions about the boxster

[Chrisw]

Well I've just got a few quick questions about boxsters...

1) Do all years come with the raising/dropping spoiler? (if no, which years?)
2) What models of the boxster come with the three spoke wteering wheel?
3) Besides engine what is the difference between the boxster and boxster S
4) I know the idea of "buy the newest you can afford"... but are there certain years in which the boxster made big jumps in proformance or styling that I should aim to get? I'd hate to think I can only afford an 02 when in 03 they made a ton of changes...

Thanks a lot guys...