I have the Sony BabyCall and love it!! I started out with a different monitor (can't remember the brand) but wasn't happy with it. When we went and looked for a better one my hubby seen the Sony brand name and had to have it and we haven't regretted the decision since. That was almost 4 years ago! I've used it with 2 kids already and plan to use it with baby #3 on the way. :) It has a voice activation option so that instead of just picking up every little noise (which you can have it do that too), it filters it all out for 100% quiet until the baby cries or makes a noise. I definitely recommend this monitor for any mommy!
Here's a link to Target so you can see it, it's $39.99:
at 12:43 AM on May. 19, 2009