If you need to adjust your fuel injector offset, you will need something that can read your fuel adaptives from the ODBII port. Most people don't worry about this and just run the offset on Roe's cards, but my car would not run until I adjusted the injector offset considerably. I used the EASE software that Roe sales.
On the WBO, I use the Dynojet Wideband Commander and it has worked very well for me. Cost about $500 and is wired into the VEC as well as a guage so I can plot A/F along with all the other VEC parameters for tuning. The gauge is useful for keeping an eye on the tune, but you really need to tune from the log files and not a gauge.
If I was to get a new setup now, I would probably look into the Innovate system first. Probably a better quality device overall and easy to run one in each cylinder bank if desired, though that is probably overkill since plug readings will give you an indication of how your left and right banks compare.
You will also need a long straight stretch of open road