If you want the best, I think the BBQ Guru Pro Com 4 and stoker system from Rock's BBQ are the absolute best.
The BBQ Guru contains a lot of pit control functions as well as wireless monitoring that is bullet proof and will transmit more than 600 Ft. It is really pricey, however.
http://secure.thebbqguru.com/Product...&idproduct=163
The Stoker system also contains temp probes that are really good. It will transmit to web pages and also your cell phone through a wireless network. I want one of these for Xmas (along with a cabelas grinder!).
http://rocksbarbque.com/
If you don't need wireless, I would check out the
thermoworks handheld units with replaceable type K probes. I have a
thermoworks thermapen, and I will tell you it is well made, accurate, durable, and made for professionals. I would assume that the rest of their product lines are the same. Check out the MTC Mini for example.
http://www.thermoworks.com/
As a tip, if you need more than one probe, you can acomplish this by buying more than one probe and then plugging the one you want to monitor into the display unit of a single display (switch it at the display and turn a single channel device into a double).
Otherwise, a ET-73 will work in a pinch.