The "hack" isn't really a hack. You wire the AFC exactly as it says in the manual. You simply use it to trim the MAP signal to the ECM and thus trimming the injector pulse, which lets you run the 450s. Since you're trimming the MAP signal by about 40%, that means when the MAP sensor is reading 0 vacuum, you can add about 40% more signal to that reading and you still won't throw a MAP sensor code. The 40% equates to about 10-12lbs of boost. You don't need to run any sort of MAP limiting device such as a missing link, and it's better not to. The DSMs work fine, and you can get them cleaned and still spend a lot less than you would on RCs. Yes, you would need a resistor box or inline resistors to run any peak and hold injectors in your car. A resistor box isn't hard to wire up, and instructions can be found here: http://www.hondata.com/techinjector.html
You can find them on eBay or you can get them from a guy named Sonny who puts together kits consisting of resistor boxes and injector clips here: http://www.muller.net/sonny/resistorbox/
The injector adapters that Viren sells plug right into your stock harness and then plug right into the DSM injectors without any wiring. They cost $10 a piece. This is what they look like:

You can reach Viren on H-T, or you can email him at Info@vsracingparts.com
The AFC and 450 setup is a lot better than an FMU setup if you're going to run up to 10-12lbs of boost. Iff you want to go beyond that, then you should really be looking into a standalone.