The 2007 will be the new X5. It's a new generation. Given BMW's track record with 1st year cars, I'd recommend that you run away from it using any humanly possible means.

The 2006 X5s are only offered in Executive Editions now (the second half of the production). Basically, these are nearly full-loaded cars with a reduced choice of exterior and interior colors.

In terms of reliability, these should be the best X5s out there.

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2008 ML320 CDI | Iridium Silver | Black ARTICO Leather | Premium Package (H/K Logic7, Parktronic, Rear Heated Seats, Rear Power Hatch, DVD Nav, 10-way Front Seats w/ Memory) | Backup Camera | Aluminum Running Boards | 4500K MTEC Low-beam HID | 30% Metallic Tint | Boomerang2 Recovery System | Weathertech Front Floorliners | Bridgestone Blizzak DM-V1 Winter Tires