Looks like you just joined the site, Welcome.
For tuners, look at the vendor page here and at suabruoutback.org for references. Seems people are pretty happy with Infamous and Bren, but I have no 1st hand knowledge.
Definitely look into a cattless uppipe. A used OEM one from an STI or later year 3rd Gen OBXT (4th Gen Leggy) would be the least expensive route and still appear stock. Don't forget the EGT sensor mod too.