I'm glad my Chinese Malaysian wife doesn't buy into this whole display of status through designer brands thing!
Nothing will satisfy her desire to show status better than a 2k Merc S-Class with it's age hidden by a private plate! Just keep the rest of the 6k spare to keep it going.
I'm only partly joking - for 6k, if you insist on it being 2005 or newer you really can't get much that's actually nice - just pov spec diesel Cs or 3s. If you dont mind it being a few years older you can get something half decent and a loved example in excellent condition rather than a bottom of the market shed. When it's clean and shiny my old 4k 530i turns heads and people are gobsmacked it's 11 years old and worth so little. I think that's mainly just cos it's an awesome colour combo (blue paint, tan leather), but also cos facelift E39 sports just look timelessly great.
And that's a thing - if this is all for show then I'd put colour way higher up on the list of important criteria, up there with condition of the exterior and fancy wheels

. If she just has a tired looking grey (some people like to call it silver so they feel better about their grey cars

) pov spec car, it wont matter that it's as new as you can afford - she'll still just blend in with every other ex company car out there.
If you dont fancy that I reckon you just have to spend more. Consider something a bit more showy like a coupe/cabriolet, or something a bit more prestige like a 5 or E. A bog standard 3 or C saloon is not remotely posh.
Good luck
