Except quad HD coming out with 2160p isn't that far away, and then your 85" TV won't look so impressive anymore except for sheer size, much like old SD DLP screens now. Not to mention the Plasma screen will destroy your power bill and need to be recharged periodically as it loses brightness.
I'd rather wait for a better resolution, lower power usage, and more reliable brightness while saving some cash to boot. This is only valid for bragging rights, any only for a little while. $30k to brag? No thanks.