I have a 99 STS ,($20,K listed at $64K) for the pass 18 months,
Great car for the price.The ride is unbeleive.
For $11G there will be very few cars on the road that will touch you.Should be able to take out any ricer out there in sytle.
Check out
http://cadillacforums.com/index.html for more information
Our STS is my wifes drive,I may not drive for a couple of weeks, I think of getting a new car until I get into it and go on the highway . This car can move.
Only problem has been the radio and a water pump.
If you can get an extended warrenty from GM do it.