I've got te ck3000 and I'm quite happy with it. If you havn't already, you can read about my install. I've used it with a t68i and a simens S56(s55) and both have worked well. There's a bug in programming it with the s56 that requires a reset after each number is added, but you only have to do that once.

If you're not depserate, the next wave of bluetooth car kits should come with displays for caller ID information. The ck3000 (and others, i assume) plays the voice tag for any incoming number it knows, so answering blind is rarely a problem.

Matthew