The Silver Press is made and designed by the guys over at Ryonet, the Riley Hopkins is a brand of press they sell.
I am guessing you have the Semi-Pro PLUS starter package, which retails for 2K. Considering its 2 years old, the screens are used, and most of the inks are gone, as well as the chemicals, and other consumables that came with the kit (without knowing what all you have) Id say you could probably get away with asking 700-800 for the equipment. Only because I am guessing the exposure unit is not as quick anymore as it was when it was used, replacing the bulbs could probably give you a better chance of getting a higher price. Also the flash unit is probably lost a bit too. The Silver press is going to be your highest selling point, it should hold its value for a few more years. Treating it nicely that is.