Best high current SS Mono amps

I'm using the X-600 monoblocks on my 1 ohm speakers. I have a large room, and I like it loud at times. I cannot imagine better monos. I have run all tubes, and have had no trouble switching to Pass X amps, and pre amps. They are perfectly invisable partners to my tubed CDP and speakers. I still must have tubes somewhere, though. With a 4 ohm load, the 600s may be overkill. They will be running class A all the time.... That's good.

Of course, for the price you are looking at, you will need to buy the 600s used. That is no problem, because Pass amp reliability is legendary.

Mark Levison 33H, super power bomber. Can drive a wide list of speakers.

I strongly second Jcbtubes' mention of Spectral & Symphonic Line (the Kraft series) from experience with an earlier (?) model of your speakers (the cls).
Among the other, excellent, recommendations, I have only experienced the 33H with cls -- but prefer the sound of the two other models mentioned above.
Note that it's just my taste, and I listen to classical & blues, some jazz.
BTW both Spectral & Symphonic Line are wide-bandwidth designs, if you're into that sort of thing...
Another tube that MAY fit your bill is the Tenor; I say "may" because I'm not sure of their driving power (nominal 75W) and, I've only heard these with box speakers -- was very impressed.
Cheers

I second the Levinson suggestion. The 33H would power just about anything I think. If you can afford more, why not look into the Halcro DM58.

Used Krell FBP350MC's or 450mcx will drive your speakers beautifully with ease. Can be found on audiogon well within your budget.