That being said, the downside of leasing is it costs more than owning the vehicle by purchasing it (loan).
Google lease vs. loan for detail.
Personally, I highly recommend leasing X5 2010 for ultimate driving experience (enjoy it as you can as others suggest), or, otherwise purchasing GX 470.
If you are looking for a real SUV without luxury, 4Runner 2010 is a must to check out.
Aslo, feature by feature, MDX 2010 costs a lot less than X5 or GX470 (GX460 this year). Check it out as well.
Currently I am leasing ML350 4matic 2009, not as good as expected. In shop twice already for oil leak and tire. Fortunate it's a lease and in 2 years I will just return it and try something else.
Hope this helps.