A:AnswerThe speakers can be connected through the USB port or Bluetooth. There is a headphone jack that I connected my old speakers to and they sound good.
A:AnswerWhile it does have a SATA-3 Port and SATA Power port on the motherboard, there isn't a drive bay to attach it to in the traditional sense. However, the front panel is removable, behind exposes two holes that are on a slim rail. From inside the pc the rail could in theory hold an SSD. The side bracket holes on the SSD do not both line up with the "rail" holes, but one would be enough for an SSD since it has no moving parts. The rail is also deep enough to give some stability.
The main storage is an M.2 2230 that can also accept a 2280. So you could also just upgrade the main storage.
A:AnswerYes, you can absolutely set up your new Dell Desktop to support two separate users. You and your wife, just like you did with your older Dell system.
A:AnswerI had Best Buy transfer all my files to my new computer, but the one big issue was many of the files became separated from the primary folder and I had to refile them, when I could locate them.