ARC SS amps are generally designed to work well with tube pre-amps, since that is ARCs specialty, so I like the idea of going with a company that addresses use with tube gear well, and ARC is ALWAYS a rock solid choice.
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Your CJ-PV9A has an "Output impedance: less than 200 ohms" this is average and could rise a little at the extremes, this is quite good for a tube preamp, and should be suitable to drive most low input impedance poweramps I would say down to 10kohm.
So look at the input impedance of whatever poweramp your thinking of and make sure it's higher than 10kohm and pick your poision.
Out of the two you mentioned above I would go for the X-250 as I've always been a follower of NP, this amp has an input impedance of 22kohm so it would be good with your CJ preamp.