I know money is something to consider, but I'd seriously look into Don's injectors. I just upgraded to Mach 5s from 1. 6s and am totally impressed. The truck can still be driven without smoking and my mileage is looking to be very close to what I was getting with the 1. 6s.
The Mach 4s have gotten a lot of positive press on here. They are a very clean 150hp injector. But I've gotta say, the Mach 5s (200hp) are pretty sweet too. I sure don't have any complaints.
Don's Mach 2 is a 105hp injector if you're interested.