I just mounted my 42" plasma on my wall on tuesday, I would suggest a mount that will take more load then that... $3000.00 plasma on a $25.00 mount.. Not me...
http://www.peerlessindustries.com
Make sure you get those screws in the center of the studs....
Peerless is awesome and known for their mounts.. they are a touch more, but worth it.. shop around, I got mine - 42 - 50" for $75 It will handle a load of 200lbs.
I Got this RECESSED LOW VOLTAGE CABLE PLATE WITH RECESSED POWER
http://www.datacommelectronics.com/product.php?ID=430 for the power and data pull... worked awesome.. although I had to cut the mount to make it fit, the hole was for single gang box only, and this is a double, which was a little bit of a pain... but it made for a super clean install. I'll be betting you will have someone to help you lift that badboy up there, I managed to lift my 100# 42" by myself, but needless to say, I was a little worried, as its an awkward lift.
Here is the same mount I got, just a bigger unit....$87.
http://www.amazon.com/dp/B0009JR460/ref=nosim/?tag=pricegrabber2-elect-20&creative=380333&creativeASIN=B0009JR460&linkCode=asn