Myself, I thought it was pretty funny that they chose the greys. Almost like, since the goa'uld chose an existing "myth" (e.g. the egyptian gods) so did the Asgard.
One thing which always bugged me about this episode, and this really is a nitpick, but when the goa'uld capture SG-1 and are marching them back to the mothership, it bugs me that they weren't tied up, cuffed, or restrained in any way. Dunno, but this always rankes.