Thermoworks is a great manufacturer... they make the thermopen (which is a must, though the recommendation for the javelin might be great as well).
Thermoworks makes this:
https://www.thermoworks.com/Smoke ...and it is currently on sale. I find it appealing because it has higher grade probes. If I didn't already have a decent wireless thermometer, I'd buy the Thermoworks smoke.
I've got one of these (cheaper than the Maverick), which i've been fairly happy with, and which is popular as well:
https://www.amazon.com/ThermoPro-TP-08-Wireless-Thermometer-Grilling/dp/B014DAVHSQThe Maverick ET732 is probably regarded (among the forums) as "all you need" and a really good value. Very popular:
https://www.amazon.com/Maverick-Redi-Chek-Wireless-Thermometer-Limited/dp/B01FEKGB9Y/ref=sr_1_4?s=home-garden&ie=UTF8&qid=1532350282&sr=1-4&keywords=maverick+etAnd... I also recently saw this... a "fancier" maverick that is "optimized" by the folks at Adrenaline BBQ. Intriguing!
https://abcbarbecue.com/product/xr-50/Adrenaline also sells the standard Maverick ET-732.
If you're willing to spend closer to $100... I'd probably go with the fancy Maverick XR-50 from Adrenaline, or the Thermoworks smoke. I'd be tempted on the smoke because of the higher quality probes.
And NO MATTER WHAT YOU BUY... read up on probe care and maintenance. I was clueless on it for some time (never bothered to read up), and kept having probe failures... leading to inaccurate readings and frustration. A few tips here:
(1) Don't let the probes or wires go directly over the coals. Most of them can't tolerate 'direct heat' (i.e., the 500+ range). Make sure your probes are routed on the indirect heat side only. Easy to keep your 'kettle temp' probe out of harms way. For the 'internal meat temp' probe... just take care to make sure your cable is elevated a bit, to the extent it ever needs to be on the direct head side somewhat.
(2) Here's the one I didn't know - DON'T IMMERSE YOUR PROBES! Apparently the joint between the probe and cable is quite fragile... and if you get water in there, you'll have immediate issues. Once I learned that, I stopped having probe issues! I don't even really use water to clean mine anymore... I just kinda wipe my internal probe clean... occasionally scrub it with damp scotch brite. I don't put any water anywhere near the joint.
The probes aren't THAT fragile... but I treat mine gently, and follow those rules, and don't have issues anymore. I was getting frustrated before I knew how to care for them, as I was having problem after problem. Now my cheapo thermometer is fine.