The HFS-3 or 6 would work well for your application. Most STI apps. have twin jets at the exit of the IC. If you are maxing out the stock turbo, then the pre-turbo spray can help extend the efficiency range of the turbo.

There are two schools of pre-turbo injection. 1) Using one of the pre-turbo sprayers we offer which holds the jet so that it sprays right at the center of the turbine to aviod any spray hitting near the edge of the impeller. 2) Spray as far away from the turbo as possible so the mist disperses and a fine fog is going into the turbo. You can look up Rice Racing on this forum and look at his work. He has done some very fine testing of this arrangement.

As far as new models, most of the line is relatively recent developments, I don't expect any system upgrades for 12-24 months.