anyone got an rs*r catback?

i just sold my crx and am ready to start building my 98 gst.
i think i've narrowed my cat back selection to 3...
-- apex'i N1
-- rs*r
-- 5zigen fireball

anyone with any of these cat backs please post some comments on them. i'm wondering about the fireball and rs*r more than the N1 (i've heard a lot of great things already and want to know more about the other 2).

i'm looking for one that sits like stock...straight exit, not angled to the left.

thanks
-ryan