okay I might as well use your thread to get this off my chest.
for those it doesn't really matter (API, seatest,red sea, seachem all fine).
those arent test that require high resolution:
ammonia: all you need to know is you dont have any. not a difficult measurable parameter from what I understand to worry about having an elite test kit
pH: isn't a parameter you ever adjust directly and to me WAY overated for testing (other than verifying your salt mix has a decent starting pH or how a planted fuge light cycle is affecting it). for example if you have good water circulation and skimmer for oxyenation and gas exchange, export co2 every now and again thru water changes and monitor/maintain alkalinity there is virtually no point in testing pH because there is probably nothing you can do that will give you any more than a temperary short lived spike. if its 7.9 live with it. you can probably count on 2 fingers how often pH testing would have saved someone from a pH crash. to prevent a pH crash you test alkalinity.
nitrite: useless, its a test that gets used during the cycle to see how fast things are moving then never opened again. you can basically test for A (ammonia) and C (nitrate) and deduct B (nitrite production) has taken place. buy the cheapest kit you can find, it will collect dust after about one or two test anyway.
nitrates: not a critical enough parameter to need absolute resolution. knowing wether your nitrates are 5ppm vs 10ppm, 20ppm vs 30ppm, 50ppm vs 65ppm is of no consequence. you basically only need to know if its excellent, good, fair or terrible and it pretty much goes like this (API and Tetra kit reference): any shade of yellow=excellent, any shade of light orange=good, medium orange=fair (action warranted) and ANYTHING else=terrible. not worth spending extra on an elite test kit
down the line if and when you are testing for phosphates, magnesium, alkalinity and calcium and/or more specific elements you can be a more discerning shopper. of those ELOS, LaMotte, Salifert, Hanna or Martini photo/color meters are top of the line (I still dont use any of those, by the time you need those your eyes are your best tool. for example my phosphate and nutrient test is looking at the glass and rocks for changes in algae growth. it could be bristle worm or pod population for somebody else. coralline algae growth is my indicator calcium/mg arent deficient. for someone else could be coral growth).
ps: I realize I sound very pessimistic about testing. dont mean to. it is very important especially early on and with changes/growth since needs always change. I'm just suggesting after a while you get your mojo going about your tank. you already know what its going to test at before you test at which point they become a verification tool of what you already know more than anything.