If you're interested in E39s, I don't think you can get a nicer car than this one:
Detailed Information - Splendid Automobiles Inc.
The price is on the high side, but it comes with all the right options - M Sport bumpers which are apparently difficult to retrofit, the 3 liter that doesn't suffer Vanos issues and high maintenance costs of the V8, and new tires.
If only it came with a 6 speed.