Speaker upgrade question.


Hi all, 
I haven't been here for quite a while as I've been happy with my KEF Reference Three-Twos driven by a Musical Fidelity A308. They're both vintage but they sound great together and fit my somewhat weird room. I'm pondering spending some bucks in the 3-6K range for new (used) speakers and I have a few questions. Thanks ahead of time for anyone who's not too busy to help.
First, would I be  upgrading beyond what my amp is capable of keeping up with? The MF is fairly powerful, but I'm not sure of its limitations since they don't show up in my current system.
Secondly, how high up the price ladder would I need to go before I'd find speakers that offer an obvious improvement over my KEFs to most ears. There would be little point to pony up money for a comparable sound, however much I subjectively prefer subtle differences.
Finally, for reference purposes, can anyone tell me how the following modern speakers might compare or contrast with mine? (Some aren't in my price range, I know) Triton 1R, Kef R7, comparably priced Monitor, Revel, Gato, Paradigm, etc. I wouldn't mind a bit more punch and a bit more bass than I have now, mostly just to experience a different sound - I respect the KEF signature sound.
I know that sometimes it's hard to accept the premises of these types of questions since such matters are so subjective and a lot of folks like to lobby for their favorite brands. I guess I'm not seeking advice about what to buy. I just want to understand the benefit to me of more modern speakers. It's quite possible it makes no sense for me to upgrade.
Thanks again.
Marc
128x128m669326
In that price range I would take a listen to Dynaudio Evoke 50. I had Audience 82's way back in the day and my long and twisted journey had led me to Dynaudio and in particular Audience 82. I still remember that sweet, warm, magnificent sound like it was yesterday (divorce forced me to sell off all of my gear 20 years ago)...I recently spent time with Excite 38's and they just didn't bring that Dynaudio sound that I remembered back, something was missing. I have however gotten that back with the Evokes. And according to Dynaudio the Evoke is one of the most successful product launches ever for them....Give them a listen they hit hard, deep, fast, and accurate. I have honestly not heard such deep powerful bass from a floorstander before...Good luck!
And there is a lot of truth in daros71' earlier response. I do love my Evokes but I would still put my old Audience 82's up against anything I've heard since. And I listened to many many this latest go round even though I was already partial to Dynaudio. Though I still ended up back there with my Excite 38's, I was truly expecting to be blown away now by everything from Paradigm, B&W, PSB, etc with supposed "advancements" in technology. Not so at all. Sometimes newer is not better...
My room is big and somewhat oddly shaped, at least for hi-fi.

There is a pair of Emerald Physics 3.4s on USAudiomart in Tennessee.  I recently got a pair and they absolutely blow me away. The MSRP was $4495, but the factory blew out some left over inventory, dramatically reducing the price. This guy is selling his for <$900.


Hurry!
M669326,
tweak1 is on it. Listen to open baffle before pulling any trigger. They have the ability to take much of the room out of it. The E.P’s are a steal, their designer moved on to develop Spatial and don’t miss Pure Audio Project. All have offerings in your price range and can be driven with almost any amp. You might just have a paradigm shift. Fun to be had for sure.