I don't think X250.5 will be optimal for your N802s.
I drive N803 with an X250.5 and it is just wright.
You'll need at least an X350.5 or if you go with McIntosh, then go for the MC501 monoblocks. Don't bother with the MC402 because it won't provide the proper drive for the N802s and they may end up sounding lean in the bass and with tilted up highs actually with both the X250.5 and the MC402. You need more power for these speakers.
Pass X350.5, MAC MC501, McCormack DNA-500, or may be one of the bigger Classe amps.
I drive N803 with an X250.5 and it is just wright.
You'll need at least an X350.5 or if you go with McIntosh, then go for the MC501 monoblocks. Don't bother with the MC402 because it won't provide the proper drive for the N802s and they may end up sounding lean in the bass and with tilted up highs actually with both the X250.5 and the MC402. You need more power for these speakers.
Pass X350.5, MAC MC501, McCormack DNA-500, or may be one of the bigger Classe amps.