Your post was probably ignored because of the formatting. It was difficult to read so I hope you don't mind me editing it.
Anyway, it depends on your long term power goals, and it depends if you want to install the exhaust yourself. Ideally, if you eventually upgrade your turbo, then you probably want to stick to a 3" catback. If not, then yes, this will be fine.
If you want to bolt on the exhaust yourself, you'll probably have to get a 3" to 2.5" midpipe adapter. I am unfamilair with the reliability of these adapters so you'd have to do some research on your own. I think Grimmspeed makes one. However, if you take it to an exhaust shop, they should be able to modify the piping to get it to mate correctly.