Nuprime vs preamp rebuild.

Joe gator and jl35 thank you both very much.  I realize that my question borders on the ridiculous.  I think it is highly unlikely that anyone in this community could meaningfully comment on a rebuilt SP-3 vs. the Nuprime.  At this point cost becomes a real consideration.  To get the rebuild and a high quality dac would run > $4K and the Nuprime would be less than half the amount.  I can afford to go the high cost route, but I am clueless as to whether it might result in better sound.  I very much enjoy and appreciate a good music system, but I am certainly not a cost be damned fanatic.  I think my next move will be to contact the Nuprime distributor in N CA.  And I definitely plan to give Tidal a shot.  Reading the blogs, it is quite interesting how widely opinions vary re Spotify vs Tidal.  About half the people feel that Tidal is significantly better, while the other half feel that Tidal is marginally better at best.  

Thanks for the above.  Given the age of my SP-3, the Nuprime preamp may do just as well, perhaps better, and of course the dac upgrade should be substantial.

Dear roberjerman—thank you very much.  I was aware of the status of the SP-3 and had no intention of parting with it.  I spoke with AR directly and got the name of a certified technician in my area whom they highly recommended.  Spoke with the latter who told me that while he would love to have my business, he felt I would get more for my money working with AR directly.  In a full rebuild, AR installs a new circuit board (I think that’s the term) which no one else can provide, and I came away with the impression that this was an important difference.  I actually never requested an estimate from the local technician what his services (parts included) might cost.  I was thinking that I would set the SP3 aside and that at some point in the future I would proceed with the full rebuild.   This leaves me with two questions for you or anyone else who cares to comment.  How do you think the preamp function of the Nuprime would compare with that of the SP-3?  Is there a big drop off or is the the difference a more modest one?  I still plan to upgrade the dac with budget around $1K.  Any recommendations?   Thanks in advance to you or anyone else who cares to comment!

Dear Joe— thanks for your last remarks; they were very helpful.   I phrased my question rather poorly, as an a vs b comparison, not a realistic approach at all.    What I really needed to know was whether those who used this unit were pleased with its performance, and I would say that you have made a strong endorsement.  I am actually in the process of ordering it at this time.  js