Responses from goldprintaudio

Thoughts on a new tube amp for high end rig? The last piece!
Rogue Apollo Dark -- 
Speakers under $50k that rival $200k+ speakers?
These were mentioned above, but the 2 models that always come to mind for me are:Joseph Pearl 3KEF Blade 
Anyone ever compare the PS Audio Stellar amp (class D) to Benchmark ABH2 (class a/b)?
PS Audio Dealer here****I've never heard the Benchmark amps, so I can't really comment on those.  But having sold quite a few pairs of the PS M700s and S300s, I'm still extremely impressed with their performance.  At their price points, they are q... 
Rega P8 with Alpheta 2?
Rega dealer here***The P8 is a fantastic table.  I've been extremely impressed with it since it was released.The Apheta 2 is also a nice cart.  At it's retail price point of $1900, it has quite a few contenders that many think are just as good.  H... 
Can you recommend a small (in size) Amplifier 150 -250 W Power per channel
Do you need small height or small width? (or both)?What price range are you looking for? 
VPI Prime or Prime Signature?
VPI dealer here****Which Classic do you have?Your setup is quite nice as it is.  In terms of "significant upgrade",  you are really not going to see that with either option.  If you want minor changes (note separation, tighter bass response, sligh... 
New Joseph Audio Pulsar Graphene 2
The answer Mark just gave is pretty close to how I feel.I would certainly say more then a slight improvement, but night and day would probably be going to the originals are just such good speakers. 
New Joseph Audio Pulsar Graphene 2
For those asking, to me the new Graphene versions have a fuller overall sound with an increase in bottom end and bass definition.  Midrange is slightly improved.....and still the same fantastic top end that the Pulsars/Perspectives always had.   
Considering a new SACD Player
Like mentioned above, the Marantz SA-10 is fantastic.  Or, if you don't care about balanced out, the Marantz SA-KI Ruby is also extremely nice at a good price savings over the SA-10. 
3 great tube preamps. Which would you purchase?
Bel Canto dealer here****  A few more options that I think are a great match with your amp for what you are looking for:Rogue RP-7PS Audio BHK PreAnd if you decide you can live without having balanced, the Rogue RP-5 would be about perfect for you... 
New Joseph Audio Pulsar Graphene 2
Joseph dealer here****Having sold a few pairs of both new versions , I can say for sure that the Graphene models are a very nice update.  The Pulsars have always been one of my all time favorite speakers, and the new V2 takes that even a step furt... 
Advise on book shelf speakers less then $750
Surprised no one has mentioned the KEF LS50 should likely be able to find a nice used pair in that price range. 
Krell Digital Vanguard or Parasound Halo integrated?
As a dealer for both Krell and Parasound, these are both great options.  But,the HINT6 is really the best deal/bang for the buck b/t the two as it's basically half the price of the Krell.To the OP, I'm in NC and would love to help you out if I can... 
A lot of hype about PS Audio, deservedly so ?
If any's interested, from a dealer standpoint, PS Audio is a fantastic company.  Not only do they build incredible products, they truly do care about their customers!  The DirectStream DAC is one of the best selling products I have, and rightly so. 
Evolution Acoustics
You have some very, very nice amps in the Apollos....and appear to be ready to make a big jump price wise by your list.  Can you audition any of the amps you have listed?  I would highly suggest doing so.....