Picade Light up Buttons and 10' display upgrade

I am looking to give my Picade (Newest version) an upgrade.

Is the 10inch Upgrade Kit worth the price? Do you really notice the difference of those 2 inches?

Also, I am looking for some arcade buttons that light up. However, I have no idea to start. I would prefer to grab something from Ebay. but I have no idea what I should look for and if I will need another power supply.

Thanks for your help!