I've never really found the need for a remote thermometer. I use a couple of these...
http://thebbqgrail.com/2008/10/11/pr...a-thermometer/
Using the WSM or UDS (and as I understand it, ceramics) once you set the temp it's stable for hours. I just pop out once in awhile and check the temp.
I gave up on remote ones because, for the most part, they don't work long enough to justify the cost.