How about the G35? You may be able to get one only slightly used for $25k. I have the 6mt version which feels just as fast as the 5.0 it replaced. I also have the IS300, which I also like a lot. Both cars are 6 cyl, rear wheel drive, and double wishbone up front. Both cars also come with limited slip differentials. The G35 is bigger and faster, while the IS300 is smaller and more nimble. The build quality on the IS is first rate. I always marvel at how well the body panels fit when I detail the car. The G35 is also well put together, but it just doesn't feel the same. I particularly do not like the way the weatherstripping sticks out of the car's doors, and that plastic bottom rocker panel (like an Audi) is a pain to keep clean.
The other cars you mentioned are also great cars, but I favor the feel of rear wheel drive cars.
The other cars you mentioned are also great cars, but I favor the feel of rear wheel drive cars.