MF A308 vs newer integrateds


A question for those of you familiar with my Musical Fidelity amp, which was the top of their line about ten years ago: what recent used integrated would represent a significant upgrade at a cost no more than 6K? Hegel H360? Devialet 200? Luxeman? I like the UK sound and I don't want to color my ATCs beyond a slight warmth, if need be. I'm wary of making a change and having only a modicum of difference in the sound. I don't currently have the ability to audition anything. This is an exploratory mission, with action to follow later.
Thanks, all.
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Just anecdotal, but I upgraded last year from a MF A5 integrated to a used Luxman L-509x just over your budget.

Current speakers are ATC SCM11v2s and there was a noticeable upgrade to the sonics going from the A5 to the 509x.

 
Hey, you're the guy from my other question. Thanks.
For some reason, that never occurred to me. Go figure. I think the tidiness of the all-in-one concept has always appealed to me throughout various realms.
I think at your current situation you would want to go to separate components to reach the next level. I could be wrong, I have never shopped for an integrated in a class that is better than an A300.