all the cars can be setup for boost, check out www.aatuning.com
they have great superchargers for the 325 for about 5g install yourself if you have some background with cars, adds about 100hp, great mod and reliable. they also sell turbo set ups. i personally own both a 318 and a 325 and by all means take the 325 if you can find one. the 328 is nice due to the torque it has over the 325, but then you get into obd2 which isnt bad.... but isnt great either. anyways i would go with the 325, and start with basic mods, including wheels tires suspension.
Anyways welcome to the forums!