AFR guage

wondering if somebody could recommend a wideband air/fuel gauge kit.
There are so many to choose from. I'm really looking for something simple and to the point, for a carbureted engine.
Depends what you are going to use it for.
For making the best use of WBO2, I recommend logging with rpm as a minimum. Throttle sensor and Vacuum (MAP sensor) are a big help too.
Several recent threads on AFR use for tuning you can look at to get some idea of what you might want to do.