I run the AEM UEGO on my race cars, simple. just a gauge and a sensor. has a 0-1v preout and a 0-5v so you can datalog.

http://www.buyimportperformance.com/..._p/30-4100.htm

for dual o2 sensors (like we have) we run this. FAST dual wideband. It can read individually, or average them. Its been one the best ones we've run with the z06 and havent had an issue yet

http://www.rpmoutlet.com/mt.htm

the one in the top right corner