I have had this amp for a couple years and never got around to making the change and we decided that we are going to stick with the system that we have in the boat which consists of a couple other Arc Amps.
This is a KS 1000.1 that is in really freaking nice condition and works 100%. There is not a scratch on the shround top, side or bottom and the mounting holes on the feet show very mininal use. It comes with a box, styrofoam end caps, bass knob, bass knob cable (25 ft IIRC), owners manual and the connection that allows you to use the speaker inputs.
A new KS 1200.1 will set you back north of $600. This amp has a little less power and is a few years old but priced right. $275 shipped gets it and I will pay for the shipping. Shoot me a PM
Please take a look at my pictures and ask me any questions.
EDIT: the "we" is pretty much my wife telling me not to spend any more F/ing money or F/ing time on that boat stereo