Re: supercharging or turboing I6?
Here we go again...
Pick one and stick with it, they are both going to give a decent power upgrade and if you are are keeping the stock gearbox either one will get you up to the 200-220rwkw that the box will take. Cost wise they will both be similar 5-8k from what Everyone has been quoting lately. Performance will be similar - the supercharged route may have a little bit more down low, but fuel economy will be slightly worse (in theory). If the top end is rebuilt, ported etc and an intercooler injectors and aftermarket chip are fitted the power level mentioned above can be achieved at around 6-8psi boost.
Turbo is probably the best if you want more power later on, it is (slightly) easier to upgrade.
But everyone has their own opinion on which is better... just watch to see how many posts this will get, mainly from people argueing which one is better. Or someone could point you to a previous thread in which the arguing which is better.