You do know that you are, essentially, asking folks to summarize the last 4 years of posts for you....

Realize that your question will likely not get wide responses and then only a few folks will chime in with their personal biases.... why not search for the 176 other "I'm thinking of buying a used X5, what should I buy?" threads and see what the collective responses have been?

I am not being a dcik, this is just the most efficient way for YOU.

I'd buy the newest diesel you can afford, ideally with a 100k warranty unless you are a pretty talented DIYer or have a good indy.

A