When I got my windows tinted in another vehicle a few years back, the best
tint film
at the time was called Luminar(?).  It was perfect (no bubbles or  such) for
nearly five
years until I sold the car.  If you could get the rear window tinted  without
them screwing
up the rear defrost lines I would do it, since that is a large area to
expose to solar
radiation. (Unless your rear defrost work;-)
Mirror tint is illegal here in Texas, and I don't like the look  anyway.
Whatever you do,
take it to a professional and spend a few extra bucks to do it right.
Nothing worse than
a window with that bubbled up crap on it! (And I hear that is from using
cheap film).
james in houston
87 westy (the phoenix)
ps
if i wasn't currently unemployed, I would LOVE to get it done here in  Tejas!
 all that glass
lets a lot of heat in ;-(