Since the PCIII and PCV are about the same price for new units, I would go with the PCV since it is newer and has features that you may want to use in the future.
As far as whether you should get a PCIII/PCV or a Bazzaz ZFi, that tends to be more personal preference. You will find members happy with either. Although, you should also consider what the dyno tuning shops in your area are able to tune or have experience with.
Personally, I have a PCIII and have had no problems with it. If the PCV would've been out when I bought my bike, I would've gotten it.
As far as whether you should get a PCIII/PCV or a Bazzaz ZFi, that tends to be more personal preference. You will find members happy with either. Although, you should also consider what the dyno tuning shops in your area are able to tune or have experience with.
Personally, I have a PCIII and have had no problems with it. If the PCV would've been out when I bought my bike, I would've gotten it.