I dont know what you are looking at, a PCIII or a PCV, because you mention both in your post and your sig.
I have the PCV with the AutoTune module, which I think is the easiest way to go. Basically you install an O2 sensor into your exhaust, AEM makes a great no weld solution for the O2 sensor bung.
So you have that set up and as you ride it will read your actual AFRs and your target AFRs, then it will calculate trims for your map, based on what it just saw. You accept those trims and it will upadate your fuel map.
This is nice if you are changing mods to your bike, or want to create different maps for different types of riding. Because the Auto Tune is always doing its thing as long as you have it enabled. You can choose to accept the trims, or ignore them.
If you get a PCV I'd suggest the AutoTune
If you get a PCIII you will probably want a dyno tune
DynoJet has a plethera of maps on their site... but when I ran the recommneded map for my setup, it ran like poo... real poo. WAYYY rich in the cruise range and WAYYY lean in the 60%-100% TPS range. So I cannot say that the use of one of their maps will help much, it may, but I had no luck.