Ilum and Belsavis both have lvl 50 daily zones.
With these daily commendations you're able to buy epic armoring and barrel/or hilt depending on your class for about 8 daily commendations a pop. Next up are rakata earpieces and implants for about 120 daily commendations. Also a mount for about 200.
The commendations needed for the raid-gear drop from the raids themselves (Tier 1 is called Tionese => Tionese commendations and Tionese crystals(both that drop in the normal mode raids))
Hope this helps