As per your OP and if you want to know only the internal meat temp, it would be a Thermapen. Approx. $79 - $99.
As others have said, Thermoworks products are about as good as it gets for Q ing.
I do temps for a living and as AustinKnight said, the K's are hands down better than the resistor type T'stats. I can't speak to the drum Bi-Metal stats as I have yet to find an accurate one.
Just my .02.
Weber WSM, Weber GA, Weber Spirit S-320
Charbroil Oilless Turkey Fryer
Wife LuzziAnn 1956 model.
Maverick ET-732, Superfast LSU Purple Thermapen, Party Q