amp or amps for Polk SDA 1 & SDA 2

I am the orginial owner of SDA1 and SDA 2. I have never been clear on weather they were versions a,b, or c. Anyhow I have always had a Proton AA 1150 or AA1200 amp running them in parallel. This works great till the amp does majoring clipping on one channel. I'm tired of it and am starting to look for a new(er) amp(s) to run my favorite speakers. For thoes unfamiliar with the Proton amps they have 6db of headroom and reted for 2 ohm loads. I have tried a Parasound HCA1000 and a vintage JBL SR6630 running just one pair neither sounded very good nor had anywhere near the headroom.

Any suggestions? Price is an object but right now am looking for a great solutions and from there will wittle down the choices with prices in mind.

As an alternative is there someone out there who could repair my Proton amps?

What do you suggest?