Jesse Warren recommended 175/30's to me. So far they're great, It'll hit 1500* on a regular looney tune, but that's with the stock turbocharger. He said they'd be a great towing injector, and can hit 500 rwhp. I was initially interested in the stock plus injectors mentioned above...but he talked me into the 175's...weren't much more ( a little over 1k, I think stock plus's are now $750)
Now, if you tow everyday, or quite frequently/heavy loads, than it might be a different story, but thus far, I'm ecstatic with them. Spoke with him on the phone, great guy, really knows his stuff, and builds a very high quality injector. He is very knowledgable about these trucks. Highly recommended.