int amp for naim cd5x

i was comparing the sound to what i heard when i auditioned the naim which was hooked up to the nait.
my old cd player was an arcam 73t with the musical fidelity tube buffer attached. i still have it and hooked it up briefly and the soundstage was much improved. also my turntable vpi jr. sounds great by comparison to the naim cd.spoke to the salesman who i purchased the ps audio gcc-100 amp from and he said the naim cd player was the worst choice to mate with the ps audio but i couldnt follow the reasoning for it.(he said this even before i stated my problem)

the salesman was actually trying to sell me a new cd player to fit the ps audio. i was inquiring if a tube amp might be a good choice because i was getting the tube itch so to speak but we wound up talking about a tube cd player instead. i liked both components but dont want to give up on the naim cd player which i did buy new about 8 months ago .seems like the nait is the obvious choice but still think abiut a tube amp from time to time. could always sell the ps amp.there was a good improvement with the borrowed musical fidelity x-150 and i know what the cd player is capable of when i auditioned it.