It is confusing. For the 45mm, the most accurate reps have the 22mm lug width. For the 42mm, all the versions from the 4th gen onwards are good.
With the movements, it's easier when you split it down into chrono and non-chrono movements. The 7750 are the chronos, they are more complicated, more expensive, and tend to be more likely to have problems without servicing. Some members have sworn off chronos. Swiss chronos are very expensive.
Pretty much all the non-chrono movements are good. The ETA 2824 and 2836 (fairly interchangeable) are both excellent. The Asian 21J (Miyota copy) which is in most of the cheaper reps is also good. Recently in the cheap version of the Ultimate PO they introduced a 'ETA 2824 clone' which caused a bit of a ripple, it's not a clone of the 2824, and it's nothing to do with ETA. That's not to say it's necessarily better or worse than the 21J, but it was misleading and it has less of a track record amongst members here.
Cheers!