Lee 757
Not entirely sure what your problem with ex-MYT aircraft is. If the 767 that is with MON was a mess, then that's Monarchs issue. They are responsible for the upkeep. With regards to the smaller ex-MYT aircraft, they were all refitted with leather seating pre merger and certainly in the last summer pre-merger we carried the lowest number of defects I have seen on any carrier I have worked for.
If you want a squeeky clean a/c, then fly on an operator that only uses it for 10 hours a day. Ours are heavily used, and yes sometimes the cleaning isn't absolutely spot on but the interiors are all pretty good. The worst part is normally the Flight Deck!!!