My system is pretty basic at the moment, but has the capability of expanding very quickly.
Currently I have one LC-1 (wideband oxygen sensor on the right bank, will get one to replace the narrowband in the left bank soon) and a OT-2 (which is an OBD2 device, allows me to log all values through that, ie RPM, throttle position, air temp, MAF output, coolant temp, vehicle speed, etc.)
I also have an SSI-4 which allows me to attach any 4 sensors I like. Currently I am not using this though.
Have a look at their wesbsite, download the software and take a look at the products.
I am actually looking at moving away from innovate though and go to a new company called
www.14point7.com They are making some very nice gear of which I am ordering some of now.
Sam