The display is the only part of the system that you will use, every day, constantly.
I didnt look at the specific products you linked to but I can tell you that although I bought a regular (non transflective non sunlight readable) display, I did try and get one that was a newer (at the time) high brightness model and the display alone was about half the cost of the system.
I thought (and still think) it was money well spent.
If I had it to do over today, I wouild go with the best display I could afford.
(so in short, to answer your question, yes, its worth it if you can swing it)