There is no limit to what you can spend. Deltec and Bubble King skimmers are the elite skimmers, but IMO
you can do a similar job for MUCH less money.
I would use an Octopus SRO6000 EXT skimmer (about $750.00)
Lighting would probably be Orphek LED
units or similar. I don't know how many you'll need because you didn't list the dimensions of the tank, but they are about $750.00 each. I would probably make my own though, and save a ton of money. You could probably make your own fixture for a tank that size for about a grand.
The sump would be a standard 125 gallon tank partitioned for a refugium (about 300-400?)
500 pounds of rock, a couple hundred pounds of dry sand....and that's about it.