Homebrew PCBs

For those of you using a laser printer to
print their artwork onto transparencies - 

Can someone recommend a brand that doesn't
deform when passed through the laser printer?
I recently took some 3M and Alpha laser
transparencies along while looking for a new
printer. I ran them through every working laser
I could find. I then printed the same test pages
on standard paper. Laying the printed transparency
on top of the printed paper showed that registration
was off on each and every transparency. This might not
pose _THAT_ much of a problem with small boards,
but I'd worry about anything larger than 3-4 inches.

Has anyone here found some transparency material 
that holds up better to the heat of the laser printing
process?  I'd surely appreciate any ideas any of you
might have on the matter.

Thanks!

I have been using Laser Transparencies for many years.
For a long time the best for my LJ printers was the 3M Type CG3300
and then I found Apollo CG7060 and it is much better.
3M is good, Apollo is much better and I can do 5 mil line on Apollo but
not on 3M.

Comparing registration from Transparencies almost certainly will be a
problem.
Paper will hold different amount of water and therefore it's stability
is questionable.

I have also found of the three program I use to print artwork when I
Mirror one side
to make the emulsion be closet to the PCB, the registration is always
wrong.
I experimented with not mirroring and found 5mil lines are just as easy
to do.

Preheating the LJ by printing something (text to save toner) on paper
just before
printing the Transparency may help keep the LJ drum at a more constant
temperature.

Hans W