Driving my Kappa 8's

Hello Audiogon experts please allow me to draw upon your knowledge. I currently enjoy a pair of kappa 8's with an adcom 550 preamp and have amplified these speakers with an adcom 555 driving the lows and a carver 1.0t driving the highs. Personally i found a minimal difference when I biamped and it seemed an aweful waste of power. I currently have the carver driving them alone as the 555 was getting hot so it needs servicing apparently.

Time to upgrade on a limited budget.... I am looking at either an audio research ls7 or a conrad johnson pv10al they both run around 6-700$. Any other tube preamps I should be looking at?

Also amp wise I am looking to get into either a pair of adcom 565 mono's, a sunfire 300 x 2, have looked at the rotel 1090, parasound hca-3500 but they are a bit spendy for me right now ugh....
Knowing the difficulty to drive these kappa 8's, Im looking for some opinions on the matter. If it would pay off to spend the money for these items I would do it. Input to give these speakers what they need to live up to their potential is welcome. Thanks folks.