I plan on getting an apexi safc-II but before I do that I would like to get a wideband that would allow me to datalog the a/f ratio with the rpm's. What is the cheapest way to go about doing this?
I really like the zietronix unit but it is a bit expensive and has some features I'll never use. I just need to see where my afr's are in relation to my rpm's and I want to datalog it so I dont have to watch and try to remember when and where i'm lean or rich. Any ideas?

Check out Innovate's LM-1. Its does what you're looking for. :)
http://www.innovatemotorsports.com/images/home_2004.jpg
http://www.innovatemotorsports.com/

Jon, did you see that new LMA-3 aux box they have, that you can now get instead of the old LM-2 rpm converter? Looks pretty cool, and with accelerometers in it, it will also log accelration and hp runs as well! All in 1.. This might be a viable alterntative to Gtechs and the like.. why not log AFRs, all your sensor, and HP and 0-60 runs at the same time, and be able to overlay the results... Sounds pretty good to me. theyre still working on it, and improving the interface, and adding another accelerometer also.. IT will also be able to log Timing advance too.