The one we have is the Angelcare Deluxe Movement Monitor :
http://www.toysrus.com/product/index.jsp?productId=2970307
We absolutely LOVE ours! We registered for it and said that if we didn't get it we would have to get the lower model since we wouldn't be able to afford it, but someone got it for us and I'm SO glad!!! We've had it since our shower in July of 2010 and the baby was born in September of 2010 - we've used it everyday since! I went to someone's house and stayed for a week who had the lower model and didn't like it & they had problems with the sensor pad not working correctly (we never did)...the only "bad" thing is they will need to go out and get a piece of particle board to go under the mattress (on top the springs) so the sensor pad can sit on that (and under the mattress).
We LOVE that it shows the temperature of her room so we know how hot or cold it is in there for her. We love that the sensor pad saved us once when she was really sick (with RSV) and stopped breathing for less than a minute at night - it alerted us and we were able to get in there to get her to breathe on her own again...there were times when she started moving around the crib that the alarm would go off, but once I adjusted the sensitivity it stopped happening.
I would recommend this (and have) to anyone having a baby! I've even told my husband that when we have our second that the new baby will get the sensor pad monitor and our current child will get just a regular monitor and he agrees.
The batteries last a long time too since they are rechargeable...17 months in to using it we haven't had to replace them yet! The receiver can last about 36 hours off of the charger! And I've even walked down to our mailbox while she was napping and gotten clear reception (it's about a half a block away since we are in town homes)!
We've NEVER picked up another family's monitor either!
The last feature we LOVE about it is that while it is on, you don't listen to static/white noise - it will only give the sounds that the baby makes (cries, moans, etc.) - like right now I have the unit next to me and it's still on and I can see the temp in her room, but since there is nothing going on in her room (because she's sitting in the family room with me) there is no sound coming from the unit at all.
(check around, I remember amazon had this one a little cheaper for a while)