Stick shift or automatic?

Im 16 years old, just got my licence a month ago, and i currently have my moms 2010 white VW jetta SE.

The thing is that when my brother who is 14 turns 16, my mom and i agreed to pass down the jetta to him, requiring me to buy a new car. The car i would get should prefferably be under 20k and i would like for it to be sporty.

I have been looking at different cars and have made a list of a few that have stood out to me in price, performance, and quality:

-2005 chrysler crossfire SRT-6

-2006 ford mustang v8

-2004 nissan 350z

-2007 Volkswagen GTI

-2004 Infinity G35

Now the thing is that all of those cars are availible in manual stick shift, and me being a car guy, would love to have more control of my car and manual just seems like more of an experience and more fun. So what's your opinion? Should i get a manual or automatic? Have any other nice looking sporty cars that you could suggest to me?

Any help and opinions are appreciated, thanks. :)

-Kevin