I've used and appreciated the Intellitouch tuner, but currently I'm using and highly recommending the Planet Waves Multi-Purpose Tuner (about $59 here in Canada). Best bass range response of any clip-on tuner I've tried and excellent rejection of extraneous sounds.

It's modular (2-piece, to be precise) and extremely versatile. The tuner part can be used 3 ways - plugged onto the piezo sender clip; plugged into a standard DI chord (it has an out as well, so can be kept in-line); or on its own as a stand-alone outboard tuner.

Neat thing is that since any tuner could be plugged onto the send clip, I've added the cheapest tuner I could find that had a physical needle display for tuning outdoors in the sunlight. (Ain't no tuner I've seen with LEDs that ain't a pain-in-the-you-know in daylight!)

Planet Waves is a division of D'Addario. Here's the tuner web page.