Don't know if you guys like sheetrock work but here's what we do. I've seen toggles work pretty well with metal but it still scares me and I feel a lot better if I can do this. We open up the whole wall and install wood studs. Above drop ceilings we use wood support members and make sure they go to something that can give permanent support.

I'm sure most of you will find this method EXTREME but I have won jobs from people by taking this approach... it makes the customer feel that you are looking out for him/her and allows you to perfectly center Plasmas for those mounts that leave no other option but 16" on-center. We get a lot of extra money to patch, tape, texture and paint.

We had a 6.9 earthquake up here in Washington a few years ago and one that rocked the old Kingdome a few years before that. Having had a few plasmas up during that one I can safely say that no one called to tell me that one fell.