I found saltwater is more expensive in the beginning, but once established, the cost goes down significantly. Everyone's got you covered here, especially about the canister filter and skimmer. I use tropic marin, and love it.
I suggest you get the biggest tank you can afford and fit in your house. Judging by your enthusiasm, you'll want to upgrade later when you start seeing all the fish and corals at the lfs :) I started off with a 45g, content with it, until I started stocking it, and realized I wanted more. a year later, I've upgraded to a 125g LOL
Ask away! You will always get a response here!