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The latest model that I know of is HSG003 (SD box). This box comes with HDMI pin. I don't think it has the traditional 3 pin RCA connector. So, make sure that your TV has a HDMI pin. If it does not, let the Sun Direct technician know about it, so that they could get you a slightly older model that still has the 3 pin option. I am using such a box, and it works fine (Model: S32201).
The latest HD box model that I know of is HSG200.
Note that there could be other newer models released for both SD and HD.