So many choices...perhaps you can tell us what you have been using this past year and "where the shoe pinches" - where you have noted limitations in what you want to do.
For instance, screen size might be very important, if you have vision issues.
Do you need a specific operating system? PC or MAC or Linux?
Replacement warranty - how long? - warranty against defects? - warranty against breakage?
External keyboard? mouse? large screen?
HDMI? DisplayPort?
Storage? Large HDD or smaller faster SSD?
Thinking these through will give you a happier result.