I haven't built a monster, but I plan to some day... However, a 2k budget will not cut it for a salt tank. I did a little shopping around trying to find a protein skimmer that would go up that high.
I didn't look very hard, and just went to a couple of websites. The largest protein skimmer I could find, was up to 2k gallon tank. They starting price of these skimmers was 2.2k and they did NOT include the pump.
Sorry, you need atleast another 10k in money for this project. If you add live rock, you need alot more money. The lights needed for this is going to cost you around 2k.
Forget salt at this level. Sea World seems a good adoption place for this pet.
Edit: Ok, I found a 4k to 5k gallon skimmer for 1.9k.. Still, No pump included.