Thanks! What do you think would be an overkill though? I mean Arias are not the most advanced speakers and there must be a level where going up in amp won't bring audible improvements. Where do you think it is?
How long is a piece of string, Past certain point speakers are so good, spending more, really your just paying for better craftsmanship and materials. Which don't get me wrong make for audible improvements as the cabinet becomes stiffer, woofers become stronger and so on.
But at the end of the day, a speaker is a few pistons in a box there's only so much you can do to improve upon it. This i why you see different shapes start to appear further up the price ranges.
1k speakers in my mind will easily be happy with up to 5k of amplification on them. (and you could go further). Well-driven speakers are always a better way to go. But it depends on the speakers! 99db efficient speakers require less wattage but good current. But the amp designs need to be more thoughtful due to the sensitive nature of the speakers, they can show up noise in the chain quite easily. But this can CAN make amps cheaper to find but harder also.
Peoples mistake is thinking "budget" speakers can't resolve higher-end kit and its quite the opposite, that's why I say don't spend too much on speakers, by all means, find some that fit and match the room (and that might come at a price). And spend if you want to but just be aware of what they really can do. And most people never take their speakers anywhere close to what they can do. And are never truly happy, because of this and always "upgrading".
Take the Kef ls50. They really need some power and control and its well documented, I've heard them on the end of a naim statement for a bit of fun, the dealer showing what they can do. And man I've never heard them sound so good. They certainly are capable of being end games speakers! But this is why you see so many on ebay, people not researching what it takes to really get them singing. Much the same with PMC and ATC
I've heard 90K worth of Audionote gear drive 1k 5 foot tall Snell speakers from the 80s listening near field, life-changing experience. In fact, this is the best setup I've ever heard and it was all of 5 watts. It ruins you if you every get the chance to listen to something like this politely turn them down! LOL!
The saying by the best speakers you can afford is completely flawed. But many will disagree and that's fine.