Upgrades to Sota Cosmos IV

Yes Alan, all the old controls are bypassed. You can get the manual on SOTA's web site.

Yes I have the Eclipse package. The improvements in sound are indirect and have to do with speed consistency. Older motors you can adjust the speed with a strobe. If you put the strobe disc on top a record with the speed set you will see the speed drift when you put the stylus down and the drift changes across the record thus pitch changes just a little depending on how much resistance the stylus is seeing. I also use a sweep arm which adds a little more friction. With the new motor the speed stays absolutely consistent regardless of pretty much anything. Thus pitch remains constant. Does it sound better. I think so but I can not tell you if the improvement is not psychological. It may seem strange to say but the music feels better. 
I prefer your Alphson as long as the bearings are snug. There should be no play. Any click and the preload will need adjustment. I do think you  would attain more of an increase in sound quality with a new cartridge but as I said that will cost you a lot more. I would do the motor first as it will out live many cartridges. But when you are up to it the best value in an inexpensive Ortofon cartridge is the Quintet Black S. As far as state of the art I can not recommend the Windfeld Ti highly enough. It runs with cartridges 3 times the price and out tracks most of them! It could be the last cartridge you ever buy. Just get it retipped by Ortofon. Your Alphson is perfect for it. You could also use any Clearaudio or Lyra cartridge. 

jazzco1, I have a Cosmos. I would most definitely get the total eclipse package. If your pump is working well leave it alone. 
I always love new cartridges but the cost of a good cartridge is way more than the eclipse upgrade. What arm and cartridge are you using now?

Mike