CT100 is what I’ve got. It’s inexpensive, but it’s just a connected thermostat (more work on your part). You have to do all the programming in ST. There’s nothing in the thermostat itself that will do anything. I use webCoRE to automate it all. Works wonderfully for me once I got the programming set up. I’ve thought a few times about switching to a WiFi thermostat, but I’ve never really found a reason to.
Edit: Missed the not into programming, so this one probably isn’t for you. Sorry.
I have the Nest v3. Check with your power provider if they offer a rebate. Ameren Illinois and Ameren Missouri both do. Mine was a check, not a credit on my bill. The Nest v3 sells for about $249.00 so with the rebate you have a quality thermostat backed by Google. Or, you could get the newest Nest, the E. This sells for about $119.00
Your profile doesn’t show where you live, but if you are served by Ameren, you are eligible for the rebate. Perhaps other power companies offer rebates as well.
On a side note, I am friends with a HVAC contractor. He told me not to get too excited about Ameren giving me money. He said I have been contributing to this for years. This is my money I am getting back.
The reason Ameren is offering the rebate is to satisfy the government which wants electricity demands reduced.
There are a ton of other Thermostats that will integrate and work great with SmartThings, but most will require some sort custom Device Handler/SmartApp etc…
The WWST devices usually all come with their own Device Type Handlers and can be Auto discovered or added from the Marketplace with some simplicity.