Wow...a good seed mix and pellet mix.  Well, we've got over 4,000 members, and if we all responded you'd probably get 4 thousand different answers.  There are several excellent seed mixes out there, my gang seem to like the Abba 1500 parrot mix better than most.  I'm making a custom mix for my big guys, since I have two macaws, a sun conure and my ekkie.  So...I get a good dried fruit/veggie mix (Goldenfeast makes some good combinations) and right now the Zupreem Avian Entrees are the pellet of choice.  Volkman's used to make a great eclectus blend of seed/fruit/veggie but changed the formula from the original and my birds didn't care for the new stuff.  Be aware that eclectus can be sensitive to chemical additives and food colorings.  I don't use the colored pellets, and try not to get the vitamin-fortified seeds or fruits.  I pick all of the peanuts out of the seed mix since I don't give peanuts to my birds.  Be kinda sparing of the nuts, ekkies tend to get a bit overweight with too many calories, I know....I had to cut out the pine nuts for mine.

 

I wouldn't go drastic on a seed mix and pellets right now.  I would see what his breeder is using and start with that--then if you find something you want to switch to, do it gradually.  Bird Talk magazine has lots of ads for different seed and pellets, and most have a website you can check out as a starting point and then start surfing for good prices. 

 

Hopefully there's more ekkie owners on the list that will give you more ideas.