Amp suggestions

The sensitivity of your speakers would give you less room to play with the volume, but there are many people who use very high powered amps with speakers similar to yours. The nice thing about them is they don't require lots of power, but they can handle it.
You don't need to shy away from the 555 is you want it, but you certainly could use SETs if you wanted. You have lots of options!
Have fun!

First of all I think you are misinformed about to much power. Most speakers are damaged from to little power because the amp is sent into clipping which damages speakers. Keep in mind that you have to double your power that you have now to get any noticeable volume change. More important than the power rating is good clean power and that is especially important with horn loaded speakers. My suggestion for an amp would be a used Aragon even Klipsch likes them they bought the company. My first choice would be used Plinius 8200 but it is about twice the money you want to spend. I don't use any thing but tube amps but I use fully horn loaded speakers and it is a good match. In your case with the new style klipsh I think SS a better match. My feeling is that is that if you want to do it right but conservative save up about 1400.00 and I would go with a good integrated like Plinius 8200I, because to many times amps. And preamps. make a poor interface, with an integrated their made for each other and from my experience that leads to great sound in a reasonable price range.

Ok, here's what it comes down to. I was satisfied with the volume when I had the adcom 5400. I really didn't want too much more volume but I wanted a little more detial and imaging. I have looked at the Anthem Integrated 2. I might be willing to go for that. Can anyone tell me what the difference in sound might be like between a 5400 or 5500 vs. the anthem when listening to alternaitive/hard rock. I also will listen to some techno/electronica at times. This is how I might describe what I'm looking for in an amp: Fast attack-quick release, able to be explosive when going from soft to loud, and of couse detail and imagining. Keep in mind the best I've ever heard was the Klipsch's with the adcom 5400. Thanks for the help. This is really my first dive into higher end stuff and I need to get it right the first time. Thanks everyone.