I didn't have any of those, but they are great choices. I DID try five or six different amps, both highly regarded tube (Sachs, LTA) and SS, some of which were recommended by Clayton. I never would have guessed the amp I eventually chose would top them all (for my taste!), until I read a long review by Mike Garner at Tweek Geek of the Modwright KWH 225i Hybrid with the X3's. I decided to give it a shot and am so glad I did. There is no logical explanation in terms of power output, etc. but they just work well together, probably running all in class A. A close second was the Cherry Amp King/Golden DTM, again a very high powered amp. Others have had great luck with low power options, which is the logical choice on paper and makes perfect sense. A good friend with X3's is enjoying them with his Prima Luna, which is somewhere in the middle. Lots of great options and the X3's will show you the differences easily, so pick what you like.