Slightly Discouraged!

[Tarolisol]

It really doesnt have to cost that much.
You dont need a sump but they can be handy.
you dont need a skimmer but they can be helpful.
I just set up a 75g cube tank, and I did it for cheap.
100 bucks for power heads
90lbs live rock 200
T5 lights 380 (ok this wasnt to cheap but you need lights for corals.

so $680 for a 75g tank. If you do lots of water changes you dont need a skimmer. But i could still add a skimmer to the tank and the price will still be reasonable.