Yes, sorry, the 24" is just U2412M. The HM is for the 22". So many models. The Dell monitors are fantastic for the fully adjustable stands, not to mention quality panels.
16:10 panels are becoming rare in any size, I can't think of any 27" ones off the top of my head. 24" is pretty big anyway, you want to step the resolution up if you go bigger, imo.
16:10 panels are becoming rare in any size, I can't think of any 27" ones off the top of my head. 24" is pretty big anyway, you want to step the resolution up if you go bigger, imo.