[ndtguy]

First question you need to answer is what do you want to do with your car? If you just want more power, get an LS1 or LT1 car. Swaps are possible, but unless you can do it yourself, it's going to cost a lot more then just trading the v6 on a v8 (and even if you can, the time to do the swap/the downtime to do things right/money/etc are much more than people realize).

You have the 3.8 pushrod engine which LOVES boost (ask the GN/GNX/TTA guys), but I can tell you from experience that a turbo car requires a lot of time and money. They're fun, but they're expensive.

As someone already asked, 5 speed or auto.

Just decide what you want to do with the car before doing anything. Sucks to spend money twice.