They're just so expensive though. Like 240-300 depending on the model.Probably overkill for the size aquarium in question but if you want to splurge then I'd suggest taking a look at the aqualogic as noted already. Their digital temperature controllers will withstand the test of time allowing you to roll through the many upgrades sure to follow.
Used across many industries such as aquaculture, zoos, bait shops, education, hydrophonics, food, and more. If it is good enough for these high demand industries then it is a no brainer for home aquarium use. In "my" opinion.
Buy once, use time and time again. Get yours today with a color catalog!