I'd suggest that you use the Auberins PID SYL-2352 and one of their RTD temp probes for your setup.
Depending on what you want to achieve and how complex a system you want to end up with (Also the power feed that you will have available) there are dozens of ways to implement a plan. In most cases, there is no need for a temp probe in the BOIL kettle.
Please give us some idea of what you want to achieve.
EDIT: I said HLT by mistake. I corrected to say BOIL.