Actually, I'm not fainting. The few prices I've seen for skimmers put a $1000 skimmer at the 500-600 liter range, so that tank would be about 5 times as big as I'm thinking.
Already got the tank and stand, that cuts off $1000. Don't really need a skimmer, that's -$1000 again, Metal halides, don't need them without coral -$1000. Base rock, 1/5th the size=1/5th the rock so $200. Sump and plumbing, not planned, -$300, Coral, not wanted, -$2000. Fish, 1/5th the fish=$200, Pumps and powerheads, maybe $100 for a single powerhead.
So, going by that logic my total would be $5300 less just for things I wouldn't need. My only expenses would be about $500. Could cut a bit off that getting cheaper fish to start with.