I've never watched any Doctor Who. Would I be able to enjoy it if I just jumped in now?
This is the best summary of the show I've ever seen:
There’s a big blue box. It’s bigger on the inside than the outside. It can go anywhere in space and time, sometimes where it is supposed to go. Something will go wrong, and there’s some bloke called The Doctor who’ll make it all right because he’s awesome -Neil Gaiman
But yeah, I agree that you should either start with the Ninth, or with the beginning of the Eleventh. The Ninth is generally considered the weakest of the modern doctors (no disrespect intended, he's still pretty awesome) so if you dislike him, don't assume you won't like the other two.
Oh, and marko, I believe it's streaming online somewhere, I'd do a search.