You have to go with Fast Intentions cat back exhaust. It has one of the most, if not the highest, gains for the 370z.....not to mention the orgasmic tone. Also affordable.
I got Takeda stage II over the Stillen mainly because of the fact that I didn't have to cut anything. It's also significantly cheaper as opposed to Stillen 3G. Got mine for $399 shipped!
As for HFC, Berk or Stillen is a solid choice. But I prefer TP over HFC if you don't mind the cabin noise too much.
And with the fine tune, you'd be pushing upwards of 320whp+
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