I went with the JBA shorties. I wish I'd gotten a before and after dyno, because there was a large SOTP difference. I've done the tune and cai, but the two of those combined didn't add as much oomph as the shorties. I also have catless midpipes, but I hope to get put on soon. Then I'll get a dyno and post it for ya.
The shorties have gotten a bad reputation, but they did work for me. JBA says 30 hp and 30 ft/lb of torque gains. I don't know if I saw THAT much, but I did see enough to make a difference in the way the car felt and drives. I suspect that the catless midpipes will take me pretty close to that 30/30 number. The dyno will tell I suppose.
So don't write the shorties off completely. If I had to do it over again, I'd do the same thing.