A Flashforge Dreamer is a pretty good choice, IMakr had an educational discount on them, which reduced it to about £500, It's not on their website at the moment but the page is still up here: https://www.imakr.com/en/education/196-flashforge-for-education.html
. It's a pre-assembled unit
. It doesn't have auto tramming/levelling, but It keeps its bed leveling very well over multiple prints, as long as you aren't too rough removing them.
. It can print any filament up to 240c
. It has a heated bed up to 110c
. It's pretty easy to maintain and repair
There's quite a few other good kits too if you're interested in building one instead.