A DHD. Not perfect, as it's a bit big, but I'm still workin' on it.
An Omeyocan (or, as they're called in the show, "GIIant AAAALLiensss") crystal skull. Apparently one of the novels (which I've yet to read, sadly) reveals that they're part of a Furling transportation network or something, along the lines of the Stargates, only.. Furling.
A ZPM. After watching Moebius, I confess these things creep me out a bit just by association. I mean, if there were one episode I'd say I really didn't like, it's that one. Really, isn't it implying that the team as we knew it from the beginning gets stranded in ancient Egypt for the rest of their lives? At least I can claim Continuum focused on an alternate reality.
The Sangraal, or Holy Grail. Man, Stargate is weirrd. (And really awesome, of course)
A staff weapon. Sorry the end isn't amethyst.
A Goa'uld communicator. Well, it's accurate, right?
My miserable attempt to build the "Telchak device", or fountain of youth. I could sworn that "Chaak" was pronounced "chalk". Apparently not.
And, finally, the Ark of Truth. Slightly modded from my earlier version.