Buying Advise - Best year? Recommended options?

[evilution915]

I started to look for a used X5 because I've always loved the look of them and came from an m3.

I'm not too familiar with the differences between the years and could use advise on what to look for. I found a thread that said 08 had many improvements over 07 including:
"I think that the suspension is a little tighter without affecting ride quality, it just feels flatter around corners. Also, they added the power tailgate, auto H which puts the car in park when you let off the brake and in drive when you press the gas, it's pretty convenient if you're in traffic a lot. The iDrive control is a little different."

Do you guys prefer the 4.8? It must be thirsty, or is 3.0si enough?

Which options do you guys find you'll never use?
The pano roof and 3rd row and two things I'd want.
Adaptive drive seems like a good option, but not necessary. How can you tell if a vehicle has AD or not? Is it a button to activate?