Title says it all, really. Looking at their technology, territories, etc. Rather than be literally insane (thanks to the sarcophagus) megalomaniacs and all the other nice adjectives used to describe the Goa'uld we'll assume there's an alternate universe out there where they used their awesome intellect and genetic memory to their fullest. Let's try to avoid hypothetical tech that they MIGHT have (unless there's something to back it up). Instead, just with the technology they have. What could their empire look like, their ground forces, etc?