I'm building an engine and I'm planning on doing all the tuning work on a engine dyno nearby, but I need some guidance on EGTs and wide band O2 sensors.
The engine specs:
2.0 L
16V
11.5:1 compression
276 cams
Individual throttle bodies
Purpose: mostly an engineering exercise, but will see duty at HDPEs and some DD. 
Getting the cylinders trimmed evenly would be nice and easy on the dyno with EGT and/or wide band O2 in each exhaust runner, but it doesn't make any sense to leave all those sensors in the header once tuning work is done and it is ready to go into the car. Should I EGT probe all the runners and only install one O2 sensor at the collector or what? I'd love some advice.
I'm not even sure i'd bother with an EGT if you're going to use a wideband. And unless i'm missing something totally crazy about the build, i'd probably just one wideband as well. Use wideband to tune, as well as to feed your management thereafter.
I have done individual cylinder EGT to set trim and a single (or one per bank) O2 with good results. I don't like all the hardware for individual O2.
I tuned a turbo miata with a wideband O2. Worked out pretty well. I would bet you could get buy with just a wideband O2. What management system are you going to use?
I'm messing with a 12.5:1 2.5 V6 with ITBs and some rather large welded cams.
Just a Haltech dual-channel wideband, one sensor for each bank.
