honestly, sounnds like a super charger is for you if you are askign all these questions and from what you want. it is simpler and cheaper. vfe kit for $4500 should put you somewhere between 260-300whp.
dont buy ebay turbo shit as it is simply that...shit!
if you do decide to go turbo the best thing you can do is read read and read...i researched for a year b4 i even started buying parts...know exactly what you are getting into and budget twice what you expect to pay. FI, especially turbo charging is expensive! unless you know how to do all your own work, welding and fabrication, ect, minus any needed machine work, get parts at discounts through hookups, expect to pay 6-8k at least. if you can get a tt kit. i wish i did but they dont have kits available for the 328
custom will not end up being cheaper unless you know exaclty what you are doing.
if you are set on going fi start saving and dont bother doing na mods as you will end up replacing most of them with the FI equipment.