Well you asked a very good ?
Now it is a matter of what you can afford, so I will give you a idea of excellent system would be.
MacIntosh all the way on the amps, deck (head) would be a product from Pioneer, but it would be the Premier
line, indash cd player with a remote for cd changer in the trunk. I would choose two 10" JBL pro line 600 watt
power handling, one would do in a pinch very easy as a
mono power amp, with electronic crossovers doing the
freq work. Then some mids and tweets depending on the kind of music you listen to. This is where a system becomes more personal for your choice. It must perform
best for you, not just some body to impress them with, although that comes with the territory. Boston Accoustics is a good brand and there is a company from germany that are famous for there mids and tweets. I can't recall them but they should be available at any great store for car audio.
I worked in the car audio business as the G. Manager
years ago, but take my word for it, $2,000 is just the starting price for a great system.
Good luck and shop carefully.