Speaker suggestions for Pass Labs x250?

Infinity Renaissance 90 if you can find a pair.

Vandersteen Quatro or 5 used.

Your amp should also drive a pair of small to mid-size Thiels without a problem.

With that amp, you can assume most any speaker you like will work well with it. So as far as I'm concerned you could just as easily ask, what $5,000 speakers should I consider. If you like the Pass sound, you amp should be able to handle most any speaker ably.

Marten DeWulf of Bound for Sound loved the amp with Merlin VSMs, which are my favourite speakers at any price point.