Considered an IS300? It's closer to your price, but not so much on the horsepower. It's pretty similar to the 3 series: I6, RWD, incredible handling, and sexiness. Of course, it also has Lexus reliability.
If you don't mind something slightly larger and slightly less sporty, you can get into and above your HP range in a 2nd Gen GS400/430. RWD + 300HP V8 is always nice. This might also fit the golf clubs better!
I would also consider a TL, but as stated above watch out for the tranny issues.
BTW, I've heard the LS is not very reliable. It's built on a Jag platform. My Dad used to work at Ford / Lincoln dealer, says watch out. They can have lots of problems.
Of course, all these recommendations are taking reliability into account as a large part of the buying decision.
I just went through this myself (sporty sedan, reliable import preferred, 10k budget), ended up with an IS300 after searching for 2 months.
Good Luck!!