Hi:
There really is no hard and fast rule for DEVICE=. It depends on the SAS/Graph program you're using and on the kind of "bells and whistles" you've added in your code (such as ANNOTATE or GREPLAY).
If I was just doing some very straightforward SAS/Graph jobs AND I wanted the graphical output to be in Excel, I would probably pick one of these device drivers:
[pre]
DEVICE=ACTIVEX
DEVICE=ACTXIMG
DEVICE=PNG
[/pre]
Personally, I like the look and feel of ActiveX graphs and the ACTXIMG driver gives you the look and feel of ACTIVEX graphics, but without the interactivity.
On the other hand, if you already have a fairly complex SAS/Graph program that looks just the way you want it, then you might be happy with
[pre]
DEVICE=GIF
DEVICE=JPEG
DEVICE=PNG
[/pre]
The Tech Support White paper
http://support.sas.com/techsup/technote/ts674/ts674.html
might be another good resource -- it outlines a ton of good information on using SAS/Graph output with Microsoft Office.
cynthia