Brian, the actual frame that goes around the
cel doesn't have to be any specific brand--all
it has to do is look good. :)  If you want to 
frame several cels in the future, try to find a 
frame that's pretty easy to get or match so 
you don't get stranded a couple of years on
down the road and have to deal with 
mismatching frames. :)  The important thing 
to remember as the previous poster said
is to use (or make sure the framer uses)
all acid-free archival materials because 
those will actually be in contact with the cel.  
You can see the cels I've gotten framed at
http://www.jenorama.org/cels/celthumbs/
framed.htm.
Good luck on your cel framing journey!

Jen