I forgot to mention raising the specific gravity to 1.025-6 as well. Oops. I have never heard of that salt, and i would personally be wary of it just because it's not a well-known salt. Might as well finish off what you have though.
To save yourself some money on test kits, don't worry about getting any until you want to add LPS (or SPS) corals. Soft corals will be ok without testing the big 3 as long as you do 10-15% weekly water changes. When you do want to add corals you will need to buy calcium, alkalinity, and magnesium supplements and test kits. You could talk to littlesilvermax on the forums here about getting some "raw chemicals" to supplement. It's quite cheap that way. Those are the "big 3" test kits you will need. For calcium and alkalinity I would suggest either API (cheaper) or Elos (pricey), and for magnesium API, Salifert (mid-range), or Elos are all pretty accurate. Don't cheap out any more than API on kits though or your tests won't be accurate which kinda make them a moot point, ya know?
Both ammonia and nitrite are generally just used in the first few months for monitoring how the nitrogen cycle is progressing and handling the addition of new critters. Later on if there are issues in the tank. Since they aren't used often you can usually get your LFS to check for you once a week while you're starting up, and going through your cycle. Pay attention to the brand of test kits they use though. Nitrate is something I like to test for one a month or so (and when the cycle first ends), which is also something your LFS can do for you, or you can get a kit of your own (I like Salifert's nitrate kit).
If you do go skimmerless you do have to be careful to not over-stock the tank, and also make sure you're up on water changes and have good circulation in the tank so that no detritus builds up. With the Fluval you will need to clean it at least once weekly. Since canister filters are a PITA to clean, I have always preferred hang-on power filters like AquaClear just for ease of changing out filter media. I find the easier it is to perform the maintenance the more likely I am (or you) to actually do it!