Replacement tires for my 350Z

Hi guys,
I will need to replace my worn OEM tires on my 2004 350Z in the spring.
I have 18" OEM rims and was wondering what the best tire would be. The car is a daily driver and I am looking for a softer ride. My current tires are really hard and the car does not steer well.
Excessive tire noise is also a problem especially from the front when braking.

I have a set of 17" OEM rims with snow tires as I drive the car during the winter and have noticed a huge differece in ride. I know the snow tires are much softer and handling is compromised.

I was considering going to a taller wall or greater aspect ratio.
Has anyone on the forum increased the aspect ratio from the standard 40 to say 50?
Thanks in advance,
Keith