replacement windows

[John Soforic]

Alside excalliber II windows or Silverline 1200 series? Anybody with experience with either... please offer your help (good or bad). I will be buying 120 double hung windows in the next 2 months for a big project, and the feedback on the web is confusing at best, mostly installers who prefer high end windows and don't care about costs of the end user. These are for rental units that I intend to hold forever...