Weber makes great products, no doubt about that and the aforementioned VirtualBullet.com website is a great place dedicated to them.
Something to consider, rather than a remote read thermometer, is that if you think you might want draft control with a BBQ Guru or Stoker, where these controllers integrate the functions of the remote read thermometers for the meat and cook chamber with a variable fan and the ability for custom programming. You tell it what temperatures you want for the cook chamber and what the "done" temp is for the meat, and it will control the airflow into the firebox as to maintain that temperature and then when the meat hits whatever temperature you programmed for it, it shuts down the airflow. Different models have different features, some will allow for multiple different temperature stages in the cooking, some have ethernet or wi-fi connectors so you can control, log and do all kinds of techno tricks from your computer. The Stoker even has an iPhone app now.
Costs a bit more, although it's really not that bad and the functionally and consistency that you gain is immense.
Two of the best controllers out there:
http://www.thebbqguru.com/
https://www.rocksbarbque.com/