Like everyone already said, definitely go with the Acurite. Here's a link to the one most people here use because you can put the "outside probe" on your UTH to monitor that as well. It also reads humidity. I got mine at Wallmart.
http://www.acurite.com/environment/t...red-probe.html
Also, I recommend a zoomed infrared thermometer for an easy point and click temps. I have both.
http://zoomed.com/db/products/EntryD...D=2&SearchID=5
Edit: Wizard is spot on. Didn't see the infrared recommendation at first.