Amp/ preamp for electostatics and why

As soon as I log off here I'll check out the martin logan forums. What I was mostly concerned with is the amplification as the PSE's seem underpowered for the SL3's. Also, they are not made anymore and would be difficult to have repaired. That being said the system sounds wonderful, I just have to have the volume cranked to 3/4 to get decent room level sound.

I would love to have a tube amp but there are two problems.One, I don't know how to bias a tube amp and;Two, I prefer monoblocks and good high powerered tube monoblocks are expensive.

I have one other thing I would need and that is balanced connections. Anybody know of a 80+ watt tube monoblock with balanced connections?

I tried to look for the M-60's but they do not come up when I type in Atamsphere. Also , when I look at most of these suggestions the prices would be way out of my range. If I could sell my amps for $800-900 I could maybe come up with another $1000 so price would have to be $2000 or under. I looked at the Quicksilver's and VTL's and the price is right but they don't have balanced connections. I know I once saw a pair of Sonic Frontiers tube mono's that ran over 100 watts and had balanced connections that ran $2500 but I haven't seen anything like that lately. I also don't want to use autoformer's, I am more of a proponent of the less in the signal path the better.