Are you looking for a pen thermometer, dial thermometer, what? I definitely suggest going digital...they're faster and typically a lot more accurate. Stay away from floating thermometers...I haven't found one that's accurate.
I like CDN digital thermometers, personally. I've used them in my kitchen for years and they are fairly accurate, fast and haven't ever failed me. BobbyM/BrewHardware.com, from these forums, has a reasonably inexpensive model that will grow with you for years. Thermapens are widely regarded as the most accurate out there, but be prepared to spend some $$$ on them.