My opinion is mostly in line with
@ChaosRock, and if you have zero desire to ever use it as a cash set as well, then what he listed is exactly what I'd go with.
With that being said....
If you're limited to 600 chips and using a 2k chip, I think that basically necessitates an 8/8/6 breakdown, then add 2k's to complete your desired stacks. Going with 8/8/6/3 gives you T10k starting stacks and puts you at 500 starting chips.
160x 25
160x 100
120x 500
60x 2000
Then I'd add a barrel of non-denominated chips to be used as 10k's for rebuys OR as bounty chips, an extra barrel of 2k's for color-ups, and the rest could be split between 100's and 500's to your preference. I'd probably get two barrels of 100's and a barrel of 500's, but that's only because this can easily double as a cash set where the denoms represent actual pennies. The T100's, then, play as $1 chips, thus getting a couple extra barrels to give me two complete racks.
My personal final breakdown with non-denoms...
160x 25
200x 100
140x 500
80x 2000
20x Non-denom
Without non-denoms, my breakdown looks like this...
160x 25
200x 100
140x 500
100x 2000
Again, Paulo's breakdown is clearly more flexible for tournaments. The only reason you go with mine is if you're looking to play it as cash sometimes, which I like to do on occasion (but obviously not while a tournament is going on with the same exact chips).