just so we're not talking past each other, remember that the forthcoming 737 MAX series is marketed as 737-7, 737-8 and 737-9, whereas the current 737NG is -700, -800 and -900.

the MAX -7 tops out at 3800nm; the MAX -9 is marketed as having 180 seats (i'm assuming that's an all economy config) at 3600nm.

A321neo/LR seems to be pegged around 4100nm with MTOW at 97 metric tonnes.

current 752 range is listed (on wikipedia) as 4100nm with winglets; MTOW of 116 tonnes (i think i got the conversions right).

i don't have enough background to give color to those figures, but there they are. i'd love to see a new 757 offering, simply because i've grown sick of the 737 fleet. pilots seem to have a strong preference for the 757 as well. i'd love to have someone like freshairborne chime in on this!