I have numerous love digital temperature controllers, different models. They have gone up in price, but I still buy them when I need them. They have all the functionality I need, plus more, and you can buy different probes of different lengths to fit your needs.
There are cheaper controllers out there, but there are a lot of brewers that are using the love controllers, and we can help you wire it up if you need help.
They simply just work for me, and I prefer to use them over a different manufacturer. I just wish they were cheaper, or at least the same price they used to be years ago (around $50 dollars).