Boys, boys, boys you need to chill. The Q5 isn't even in the same market segment--it's a compact SUV whereas the GC is mid-size. So, comparing the 2 on MPG and handling doesn't make any sense---of course a 2.0L engine on a smaller car will get better MPG than a V6 on a larger car, etc. And there is no NAV on a base Q5 + if you are going to go base models then you can get a GC for probably less than $30K. It's not an apples to apples comparison.

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2008 X5 4.8
Jet Black/Black Nevada/Dark Burl Walnut
Adaptive Drive
Premium Pack
Tech Pack
Climate Pack
Sport Pack
20" Wheel Option
Premium Sound
Sirius Satellite
Rear DVD Entertainment
Multi-Contour Seats
Comfort Access
3rd Row Seat
Heated Front Seats
Running Boards
3M VentureShield Paint Protection Film