Thanks for responding, this one has the model number as cl-750 and it has a stereo, it is an older model I think.
I thought the difference between neptune and mariah was number of jets, but I know next to nothing. :-)
They are asking 1500 and we tried out the pumps and the control panel today and they all seem to work.
Didn't get the chance to check for leaks or confirm the heater but it all looks good.
Think I will bite the bullet.