Saltwater is obscenely more expensive than fresh. Expect spending at least $1000 to set up your 75g properly.
+1. I'm setting up a 75 FOWLR and have $300 for 4 pieces of rock, $70 for 3 fish, and close to $400 in a sump and skimmer. You could do things for much less of you find an lfs that sells bulk rock cheap, or see if someone is breaking down a tank.
Salt isn't that hard compared to freshwater(I have 3 FW tanks and the 1 SW), and the hardest part about salt is the gut punch my wallet takes everytime I buy something for the 75.
The decision is really up to you though.
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Saltwater and Reef Aquarium Supplies - Bulk Reef Supply $3 per pound for dry rock. No need to waste money on live rock.
Quite honestly money is a little tight right now, so I chose to go fresh water and get two Red Tailed Barracuda's. How long should I have the tank cycling before hand?
I would advise against the red tailed barracudas. They really need a much bigger tank than a 75g.
Take a look here for a cycling guide http://www.aquariumadvice.com/forum...guide-and-faq-to-fishless-cycling-148283.html
Quite honestly money is a little tight right now, so I chose to go fresh water and get two Red Tailed Barracuda's. How long should I have the tank cycling before hand?