Am I crazy if I buy an x5 v8 with high mileage?

[Miyanc]

Ok so I have been back and forth with what I want and should buy. First let me say it's not a daily driver. This will be a second car for transporting myself and scouts on trips,limited back and forth around town. I have a take home vehicle I drive to work. I have debated(and depending on what's available when I buy). But usually fall on BMW X5 or Land Rover . I am only looking to spend 5-7k . In my area I have found many that look good from far and over the next few weeks may start getting abetter look.
I actually like both these cars for different reasons. BMW for driving experience and Land Rover for rugged and maybe more luxury.
If I get the X5 I want a V8. The newer the better 2004 to 2008. I realize even with proper maintenance these vehicles can get squirrelly. At 150-200k anything and everything can go south and quick. I am not shy on doing my own work. I am not sure I have the tools for the heavy stuff.

As a secondary vehicle I just need it to be reliable enough. Forums by design highlight what wrong with things.

My biggest question is what is the general opinion on year and which model V8. I get he n62 vs m62 and see it discussed. I am going to assume all 3 (4.4, 4.6, 4.8) will have push enough. Years to avoid or features, packages to get or not. I will look for the best I can get in terms of condition and service.

Thanks in advance