Mapman, my post was merely to get Heywaj10 thinking about the amp as he shops for speakers, rather than ignoring it, purchase speakers, and then think about it.
I have not made any recommendations on speakers, but will say I am somewhat confused by yours.
In your 1st post,
For prog/metal/rock in particular if you liked the little GEs and PSBs, stretch your budget a bit perhaps, maybe consider speakers with larger drivers and or cabinets and maybe even a tad more efficient where possible. Little speakers will struggle to deliver the power and impact that ones typically wants with that kind of music at reasonably high volume levels.
I've heard both the PSBs and the GEs and I think you summarize them quite nicely! I think the Aeon 3's in particular to be a very good value for a speaker that size and price. The polite top end of the Aeons could help make for longer listening sessions without fatigue with that kind of music. For their size and price, hard to beat. But bigger may well be better in this case, if you work to find something bigger that can fit in your budget range. More efficient may be nice also, again, depending on what amp will be used and room size/acoustics.
Seem to be recommending larger more efficient speakers, and I do agree they typically deliver more power, impact, and dynamic range at higher volume levels.
Then in your last post,
For prog rock music, you want speakers that are relatively flat well down in to the 40 hz range or so at a minimum, more if you want to catch all of Rick Wakeman's organ, etc. So larger more efficient speakers and less powerful amp or smaller less efficient speakers and more powerful amp, those are the two ways to go. You need smaller speakers with some low end that can achieve some decent SPLs (can't be TOO small and must be well built with good quality drivers to hold up), so you will need an amp that is up to the task. NAD is not a bad choice but I would be considering a 250 w/ch class D amp like those from Wyred 4 Sound possibly for the very best results with most of the smaller speakers that will likely fit your bill.
This post sounds like you are recommending smaller speakers with a class D amp that is twice the budget that Heywaj10 has stated for an amplifier.
Given the maximum budget of $2200 for amp and speakers, and being able to ROCK, it is probably best to stay away from speakers with the lowest sensitivity.