I have been researching lights a bit lately as well.
My observations:
1. LED panels are the standard and by far the best option. For a 9ft table I like (2) 2x4 panels at minimum.
From there, do you desire your light to be part of your decor and design or simply provide light and be hidden?
1. If you want the light as part of the decor, there are a few guys selling attractive boxes with the LED panels to match table.
2. If you want them to be less of an element of decor, go to Lowes and get the LED Panel for about 80$ each and mount them flush to the ceiling. They are already white and only about 1/2" thick.
Option 1 can easily easily cost 6 to 7 times option 2.
I am going with option 2, not for cost, but because I want the lights to just blend in with ceiling and not take away from tables. Cost is just a bonus.
As always, my opinion.
Ian