im currently supporting narrow band sensors (the 0-1V thigs) what only tell you rich or lean.
but also a LC-1 or the PLX SM-AFR work (both testet) and with them you have the bosch LSU 4.2 sensor. the 4.2 is in all current vw/audi cars, so i would call it a good sensor 
high pressure i think is no issue, if you have that high backpressure in you exhaust system, you have a general issue...
making a wideband controller yourself is nice, buts its nearly impossible to calibrate (or do you have a calibration gas tube?) so for example the LC-1 is a perfect working plug and play solution.
you can just take off the lcd and put any displaying device there, theres nobody stopping you from that 