Car question

My car is 14 years old and even though I could keep it running forever the parts are starting to go obsolete. Some things, like the plastic headlights, will not even be available from junkyards. I will keep it going until it really gets hard because of what it takes to replace it.

It has:
300 hp with a very wide power band and plenty of torque
Room for 4 adults
Very responsive performance, even though the programming is stock
Weighs about 4000 lbs, I don't want much lighter
Handles above average but still comfortable
Good trunk space
Very nice interior
Lots of luxury gizmos for a '98, many are standard on a lot of cars now, like coil-over-plugs, wipers turn on headlights, seat memory, etc.
Relatively inexpensive to maintain
Rear wheel drive
18/24 mpg

Is there anything for less than 45K that's not more than 2 years old that would be a good replacement? I like a larger sized car as opposed to something like a Vette or Stang because they don't get tossed around as badly on the road I have to drive every day. It is curvy and rough and uneven.

A BMW 6 series is a pretty good match but expensive, even used. Maybe not so cheap to maintain.