I have a Conrad Johnson Premier 4 tube amp that is rated at 100 WPC that i don't use anymore because I now have a pair of Conrad Johnson premier 5 monoblocks in my system.
If you are not familiar with how tube amps work, and their inherant storage capacity, you may be gettin in over your head. An all tube amp rated at 100 WPC will surpass the performance and sustained higher voltage requirements of a solid state amp rated at 900 WPC.
It will also handle the crazy capacitance variance of planar speakers with ease, compared to a solid state amp.
However, $1000 won't get it. I would sell it for $1500.
You can go to the Conrad Johnson website and check it out for yourself, but it cost over $4,000 new.
Think about it.