King of High Current Amps

I'd recommend the Aragon 8008. I've seen the 5 channel model that retails for $4k selling for just over $2k (new), so you should be able to get a good deal on the two channel version. I've driven the Apogee Stages with the Aragon with great results.

I'd check out the Innersound ESL Monoblocks. I've been very impressed with their level of detail in driving my power hungry electrostats.

I just dumped a sunfire because of its frequent loss of controll in the bass region. For under three grand you might think about a KAV Krell unit on closeout. You can save 30% at almost any dealer right now and have an amp that will hold decent value when you step up to the big 600c. Good luck!

The Classe DR-# amps have a lot of current and headroom. The DR-3 is one of those that will drive anything, and with 8db of headroom. I saw one go for $650 not too long ago.

I used to run a set of Adcom 565 mono blocks on a set of Infinity Kappa 8's & they played loud enough that I could wear my earplugs & pretend I was at a concert. I also brought home a Sunfire amp to give it a test drive & it caught on fire! No kidding, I thought my drivers were going to start shooting voice coils across the room by the sounds that they were making. I was using a Cary pre at the time & it was actually a pretty sweet combination. A used set of 565's can be had for around $900.00. Another good high current amp for the kappas is a Bryston. I used a 4B ST with the Cary & Infinity's & although not quite as loud, had much better detail & a bigger soundstage. Both Adcom & Bryston were fantastic for playing music in the range of loud to extremely loud. I've since changed everything in my system but you could feed the old style Kappa's designed by Arnie Nudell as much CLEAN power as you wanted without fear. Good luck in your search!