Thanks for all your discussions. All your experiences are very helpful for me. Now here is my top list and reasons:
- Cinnamon (most familiar and very stable for me)
- XFCE (I like the responseness and lightweightness)
- MATE (stable and reliable)
- KDE (I like the configurability, but unfortunately I experienced a lot of instabilities and accidents)
- Gnome (I don't like the new UI concept. When I tried it, it was laggy and non-responsive)
Out of this list:
- I3 (only head good things, but never tried it on my own installation)
- Cosmic (first time I heard about today)
- Budgie (first time I heard about today)