Rogue Rap-1 to RP-5

The RP1 is OK but early versions sounded bland and lacked transparency.  
The RP 5 sounds better, much more refined, more dynamic and more transparent.  The phono stage is much better.  
HOWEVER the one I recommend you get is the RH 5 headphone amp and line stage with optional phono.  
The sound is much better than the RP1, I prefer it to the RP 7 which i also owned.  
Tge RH 5 is a smaller unit but has a huge, dynamic, driving transparent sound and excellent transparency too.  
With the RH 5 you can use the balanced connections to the stereo 100, lowering noise and improving dynamics.  The RP 5 does not have balanced connections.  
Check stereophiles review of the RH 5, it is awesome !  I didnt even use the headphone amp. i

@audphile1 

i ran the RH 5 with the Stereo 100 (great pairing) and also the Parasound a21+.  I preferred the sound of the Stereo 100 overall, especially bass and dynamics.