You can always build your own library for schematics. I believe the electrical add-on has some of these symbols. I have not used it but there are some things which may be useful over and above straight AutoCAD like labeling - supposedly you can change a label in one spot and it will change that label in all spots in which it is used (which would be very nice) as an example. If your not doing board level design then AutoCAD is probably the most universal but apparently 'promis e' is also used alot (what kind of name is that anyway?).
Get the evaluation copies and load them and see what you think. I would think some trial versions would be available but maybe not.
I mentioned ACCEL before, this program is used for board layout, yes, but it is also used for schematics (geared for board level design, caps, R's, transistors, IC's, transformers, chokes, etc). Where AutoCAD probably has push buttons, transformers, breakers, switches, etc more panel layout and power type stuff.
ACCEL would allow the file to be imported into a board layout program, eliminating some work, where AutoCAD files can not. I suppose some PCB programs may take an AutoCAD file but not for schematic, they will for the actual traces and such but not schematics that I know of.