Serious question it will decide the fate of the next few years of my transportation. I already know that the Si is 6 speed, its much more reliable and it sucks less gas and is a little more expensive. The SS/TC is turbocharged, its got more horsepower but sucks more gas and is cheaper. Provide as much detail as possible and thanks!Plus i have a connection with getting the Cobalt for much cheaper , thanks again! If i dont get the TC or Si ill prob buy a Cobalt SS w/o the TC and install a cold air intake. Or a 2000 Honda Civic Si.