I have owned Carver gear and seem to recall it has a lot of power...is the CM1090 different. I would recomend you try the new speakers with what you have for a while to see what you need (ie; does the sound lack anything in your system)

to biamp the Kappas.  Otherwise there are used Emotiva XPA-2 power amps in excellent condition around for $650.

http://www.audiogon.com/cgi-bin/cls.pl?ampstran&1309912779&/Emotiva-XPA-2-New-in-Unopened-

and those Kappas will really sing with at least twice that.  Don't be afraid to feed them adequately, the rewards will become apparent.  An Adcom GFP-750 would be much better for a two-channel system preamp.

http://www.stereophile.com/solidpreamps/133

Good heavens! what are you trying to do, deafen yourself....150 watts is a LOT of power and will make painfully loud music.

has a interesting impedance curve, dipping below 2 Ohms a few times across its frequency response.  So, one, you should have a rather robust amplifier which can accommodate those dips and two, an amplifier with plenty of reserve afforded by a huge transformer and adequate filter capacitance.  So, we are not seeking painfully loud volumes, but a good match to provide the current the speakers may call for during enjoyable listening levels.

GFA-555 will have more difficulty with the Kappas than the Carvers which have a 2 Ohm rating.  For preamps you must mean the Adcom GFP-555 which is a fair unit, but the GFP-750 is out of your price range I guess.  The Rotel RC-1070 can be found for around $300 used and is a very nice unit.

JIMV wrote:

Good heavens! what are you trying to do, deafen yourself....150 watts is a LOT of power and will make painfully loud music.

Those Kappa's will eat 150 Watts as an appetizer.