OP,
Your thoughts on the larger ATCs are justified. I can still recollect the boogie factor on the large ATCs. They were playing Daft Punk’s Loose Yourself to Dance. It was late evening and I was tired. But still felt like dancing! Stayed back in the room till the song finished. Go for it, if you can. You can get a powerful amp later. I believe they were using some Audionet amplifiers, if I am not mistaken. But a memorable experience.