i might as well chime in here, since i usually buy extended warranties.
for starters, i'll assume the Toyota dealer handles things ideally and without hassle.
from what i've found, 8 years is the point where things start to go wrong...so, if they had a 10 year warranty for $3500, i'd be tempted...but 7 years, i wouldn't bother...my back up camera went at around year 6, but that was about $500, so i'm sure you could either just pay for minor stuff or perhaps get an indie to do it cheaper (or do it yourself if you're handy)...the big stuff is the part to worry about, but as rrocket said, the hybrid system and powertrain already have a pretty robust warranty, so you aren't getting that much extra for the money there.
regarding the rust stuff, usually something like Krown is your best option, but it depends on what they apply...sometimes the stuff they put on is pretty decent and then you don't need the hassle of annual sprays, touch ups, inspections, etc...you'd have to go through their "package" to see what it covers, etc...if it's the "Electronic" thing, don't bother as they do nothing.
